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Best 6sn7 tubes?
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Best 6sn7 tubes?
allied333, Jul 14, 2018 Aug 10, 2022 · 1. what 6SL7 for those? 2022-12-06 12:58 am 110k seems much too high a plate resistor for the 6SN7 gain stage in this circuit. Or fastest delivery Wed, Jun 12. ( 17 customer reviews) $ 2000 US Value. Platinum grade - The best of the best. Other 6SN7 have too high distortion IMO. I built Frank's preamp and I am very pleased with the outcome. As we all know 6SN7 is a double triode and for my design I will tie the two sections in parallel. Tried 1952 Slyvania bad boys, but tubes were dead. Thetubeguy1954 (Tom) Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society Shootout of Nos 6sn7 tubes. These specialized tubes are designed to separate blood into its various components, makin. I have been on the hunt for some 5692s for my Wright WLA12A preamp. Serum separation tubes have revolutionized the way blood is collected for medical testing. The Ta-26 uses a time-tested combination of tubes, so we can learn a lot by looking at what has worked well in other amps that use the same pairing. Thus its tonal balance is kind of neutral. Expert Advice On Improving Your Home. 'G' = glass body & 'T' = short bottle. Of course, the new tubes have to burn in first. Its large octal format is more rugged and less prone to intermittent pin connections than miniature type. Balanced input buffer. A 6sn7 tube preamp is a popular choice among audiophiles for its warm, rich sound. Those are great old ads. 29 ratings0 out of 5 stars #85,826 in Musical Instruments ( See Top 100 in Musical Instruments) #365 in Guitar Amplifier Tubes. The best vintage sound is difficult to come by, and these tubes provide excellent value for money. This entry was posted in 6sn7/ECC32 by tubemaze. Tung-Sol tubes reflect the best in vintage Tung-Sol construction with unsurpassed tone and reliability. Hytron CBS 5692/6SN7 Tubes. The 6sn7 tube can handle 4. 0 bids · 6d 23h left (Sun, 06:08 p) +C $31 from United States New Matched Quad (4) Psvane KT88C Hifi Vacuum Tubes $172 NP205-4. New Sensor is an American corporation and since taking ownership of. Visit us now! A question about a pair of 6SN7 tubes that aren't matching. Same tube as 6SN7, 6SL7. There are many good 6sn7 tubes available. These vacuum tubes were designed to provide a medium gain for audio amplifiers during the 1940s and 1950s, and were also used for programmable digital computers. The only NOS valve dealer with a real webstore. Today's new production 6SN7 tubes can handle max 450V. Excellent driver tube in. Indices Commodities Currencies Stocks db What to watch for today London deals with a hellish commute. It has been a while since the Schiit Audio crew got together for one of their blind listening tests conducted at a California retail location dubbed the Schiitr. They will give you that big, beautiful classic tube sound. There were a number of varieties and I like the late 1950's (charcoal black plate and dark red base) the best. Overall, the sound could use some more "body" and fullness, especially in the midrange and wouldn. Availability: Usually ships within 24 hours. Other 6SN7 have too high distortion IMO. To match the two sections closely enough is hard Find many great new & used options and get the best deals for MELZ+6SN7+Vintage+Tube+%26+Tube+Socket at the best online prices at eBay! Free shipping for many products!. The Feeding Tube Awareness Foundation estimates that approximately 20% of children under 18 are tube-fed, and there are more than 350 conditions that can require children to need n. Now the tubes have been playing for a few hours and I'm already excited. This causes all sorts of pro. I have been using an Exemplar modified Denon 3910 for. andyjevans said: Yes, I suppose that's the case. The Tung-Sol 6SN7 preamp tube name and trademark have been acquired by the New Sensor Corporation. The 6SN7GT tube type was formally registered in 1941 by RCA and Sylvania. I've contacted Schiit and am waiting to hear back about getting new tubes. Daniels I have a pair coming. 6CC1 is a compatible product before and after 1950, until the end stage is 6CC10 from mid-1950s. About This Listing. Tried 1952 Slyvania bad boys, but tubes were dead. Technically a CV181 is not compatible with 6SN7, but their CV181s are exactly the same as a 6SN7. The best vintage sound is difficult to come by, and these tubes provide excellent value for money. If the RCA 6SN7 that I got yesterday perform like the JAN Philips 6SN7 I already own, then I think I made a good deal as they were originally marked 75$ but with the "Best Offer" option I offered the seller 50 $ and a cheaper shipping to Spain. None of these tubes made use of all pins of the octal base. However, if you want replacement tubes from us, we have you covered. Watch this video to find out how to seal up the nozzle on a partially used tube of caulking to keep it from drying out. It has a higher plate dissipation, but is also larger and has a bigger footprint, which is why it lost ground and was eventually replaced in most applications by the smaller miniature tubes. Fact 3: By the late 1960s, tube manufacturers were relabelling tubes willy-nilly in an attempt to minimise their losses in what was essentially a dying market The 6SN7 vacuum tube is a dual-triode preamp tube with medium gain. These sweet treats consist of delicate pastry tubes filled with a rich and cr. The best reviewed KT88's are the Psvane KT88-TII, similar to vintage Mullard's, but they run $185/matched pair. So far 1578 Melz got the best score just above TS bgrp at less than half cost. I'm looking to add some warmth to my system, and want to explore changing out the driver tubes in my Amplifier which run 6SN7s. They happen in the first month of pregnancy. May 5, 2024 · 6sn7 tubes 6sn7 double triode jj preamp tube New 6sn7 tube available. Finding the Best 6SN7 Tubes in your 6SN7 Stash Comcast Radio Orphanage. Those are great old ads. I have RCA 6SN7GTB that I could use. May 5, 2024 · 6sn7 tubes 6sn7 double triode jj preamp tube New 6sn7 tube available. Neural tube defects are birth def. Sophia Electric Blue Glass 6SN7 Tubes99. The cleartops sound nice and balanced, but the best I've found IMO are the RCA blackplates with the center shield. This causes all sorts of pro. These tubes have incredible air, image, "rosin-on-the-bow" realism, and powerful yet accurate bass. It has all the sparkle and depth you want without the high price of NOS. japanese supermarkets near me Disconnect Pin 9 and make sure that whatever is connected on pin 5 is moved to pin 4, and move connection from pin 9 to pin 5. Get the best deals for 6sn7 tube at eBay We have a great online selection at the lowest prices with Fast & Free shipping on many items! When considering the Super 6SN7's sonic performance at its price point, its sonic strengths, the enthusiasm that pals shared over several listening sessions, and having Aric Kimball standing by his offerings and helpful tube advice, I can give a "most highly recommend" designation to the Aric Audio Super 6SN7 Linestage. I'm buying some replacement tubes for my preamp, which uses 6SN7 tubes. For a limited time only, we're selling a single tube at an introductory price of $18499). He runs them in his Don Sachs preamp,on Mr. It can handle relatively high plate voltages, typically up to 300V, and has a maximum plate dissipation of around 5 watts. The amplification factor of a vacuum tube is defined as the ratio of the maximum anode voltage to the. At last! More of the rare RCA greyglass 6SN7GT blackplate tubes! These pairs are the cream of the crop, carefully matched to within 1-2 percent. Ray Tubes 6SN7 RESERVE Vacuum Tube $209 Tube Pack: Single (1 tube) Add to cart. So, for now I have 3 of the stock JJ 6SN7 tubes, and one Tung-Sol. Shootout of Nos 6sn7 tubes. The power tranformer is a Hammond 278X (800V CT @ 230mA + 5V CT @ 3A + 6 The choke is a Hammond 193J (10H, 200mA, 82 ohms) and the audio output transformers are Hammond 1627SEA. Here is the description of that Tesla 6SN7 or 6CC110 (google translate from Japanese to English) unused 6CC10 of TESLA still have not seen at auction overseas, is an exhibition of the same Rottopea. The sound signature is on par with 5692 types. Thetubeguy1954 (Tom) Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society Shootout of Nos 6sn7 tubes. It was then generally replaced with smaller preamp tubes but was rediscovered in the 1990's where it became popular in the hifi audio world. Linlai is a little less clean in the bass, and is again a little sweeter in the mid and treble range. The Tung-Sol 6SN7 preamp tube name and trademark have been acquired by the New Sensor Corporation. Daniels I have a pair coming. May 10, 2020 · The Psvane UK-6SN7 Hi-Fi vacuum tube was allowed to sit in the middle, which guarantees a good distance between the tubes. The RCA vt231 are warm sounding, almost the polar opposite of the WGTs. This will keep the unit from over heating during this burn-in procedure Install your new 6SN7 tube and power the amp on again Wait We find that approximately 72 hours will do. reddit umich RCA5691, Psavne Acme 300B, Psavne Acme 805 are also being used in Line Magnetic 508 amplifier. The 6SN7GT is an octal base medium-mu (20) [i medium amplification] double-triode tube There are always 2 separate plates in 6SN7 tubes. Perhaps the Tung Sol 6SN7 round plate is equal. 2 tie) National Union black glass 6sn7/ tung sol round plate black glass 6sn7. Tung-Sol 6SL7 Vacuum Tube (Close Runner-Up) Tung-Sol 6SL7 is a detailed and warm vacuum tube. Find many great new & used options and get the best deals for Sylvania 6SN7GTA Vintage Tube & Tube Socket at the best online prices at eBay! Free shipping for many products!. Javascript must be enabled to use this site. RCA5691, Psavne Acme 300B, Psavne Acme 805 are also being used in Line Magnetic 508 amplifier. what 6SL7 for those? 2022-12-06 12:58 am 110k seems much too high a plate resistor for the 6SN7 gain stage in this circuit. Although the 6S-series tubes are often metal-cased, there was never a metal-envelope 6SN7 (there being. so I wouldn't worry too much about options. The amp was released around 2013. Dec 2, 2012 · Dec 1, 2012 With 6SL7GT and 6SN7GT , they never made a metal tube or st shape in vintage tube. With fewer than 5% of tubes making the grade, each 6SN7 Select promises exceptional. Some clients say these are the best 6SN7 tubes they have ever heard. Linlai is a little less clean in the bass, and is again a little sweeter in the mid and treble range. I have used the 6SN7 recently with excellent results, and also the 6FQ7, and 6DJ8 on previous builds. sunbury daily item obits Started out with 1960's GE 6SN7GTB's, that didn't last too long with bass issues and a too zippy treble. I've been trying to go on a bit of a rolling spree to find my favorite 6SN7 tubes, and despite buying some tubes that are among the "best" (according to the "cools" on various forums), I've had some. Often labeled with JAN-CHS (equals Sylvania-made military stock) The A is generally a taller bottle with the mica above the metal band while the W has the bottom mica a bit below the metal band. GTB is variant of GTA, with a heater warmer control to further enhance reliability when this tube was used in TVs. Very hot testing tubes with great gain, yet incredibly quiet. The best vintage sound is difficult to come by, and these tubes provide excellent value for money. Its mu of 20 is a nice compromise between the old low-mu types and low-current high mu types. Can anyone recommend newer versions,that sound really well,and have low noise? A user compares six different brands of 6sn7 tubes for audio amplification and shares his impressions and ratings. 1966 Toshiba 6SN7GTB ECC33 6SN7 Tall Bottle Tubes, Matched Pair, NOS Testing, Matched Codes. Perhaps the Tung Sol 6SN7 round plate is equal. Its large octal format is more rugged and less prone to intermittent pin connections than miniature type. I spend a lot of time in my shop and I figure I may as well have a great sounding stereo system!I will also be build. Copper tube is used for refrigerant piping between components of air conditioning systems and must be properly sized. Power off the amp and remove the 6AS7/6H13C power tube. The UK-6SN7 tubes are expensive at just just under $100/matched pair. 1000+ Head-Fier Joined Jun 22, 2019 Posts 1,110 Likes 2,709 Location London, United Kingdom [Thanks to @tintinsnowydog here is a consolidated list of tubes in this family] Inspired by The Reference 6SN7 Thread, I thought I'd start one for the 6J5 "family of tubes". There are many good 6sn7 tubes available. Power supply with CLCRC should be quiet. Verified purchase: Yes by alexe_gavri Apr 09, 2017 Rochester,NY. 1000+ Head-Fier Joined Jun 22, 2019 Posts 1,110 Likes 2,709 Location London, United Kingdom [Thanks to @tintinsnowydog here is a consolidated list of tubes in this family] Inspired by The Reference 6SN7 Thread, I thought I'd start one for the 6J5 "family of tubes". Unlike the 5692 (6SN7 type), it sound good but is also meant to run at a lower current range and voltage, which is why it has a stated 10,000 hour life. Home / E-Series (Flagship) / Linlai™ Global Elite E-6SN7 Vacuum Tubes (pair) Linlai™ Global Elite E-6SN7 Vacuum Tubes (pair) From: US $ 265 Please select purchase option. The 6SN7GT is an octal base medium-mu (20) [i medium amplification] double-triode tube There are always 2 separate plates in 6SN7 tubes.
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I brought 2 and both were noisy crackling. The Psvane 6SN7 UK are not bad, they are not the best 6SN7 tubes on the Psvane catalogue, I think they are the cheapest ones, and their sound is good. With measured parameters "as new" (110% current, 115% conductance/gain). The best treble I've heard is the 1952 Sylvania 6SN7GT "Bad Boys". It runs on a heater current of 03V). This tube type is widely used and can be found in a variety of preamps. Nov 27, 2018 · Tung Sol black round plate is the best 6SN7 ever made IMO. 6P5GT RCA or Tung Sol are the most linear tube in this amp gain class (see plate curves) and a pair outperforms any 6SN7. high-end audio applications 6SN7GTB Tung-Sol specifications (PDF) Here is my design of a 6SN7 (6N8S) based preamp with parallel sections of the tubes. It was a commonly used tube from the early 1940's into the late 1950's. The GTAs sound cleaner than the GTBs. ( 17 customer reviews) $ 2000 US Value. The Tube’s worst strike in decades began last night, when some 20,000 transit union members walked out Good morning, Quartz readers! What to watch for today Will more Chinese stocks halt trading? The steep declines in Chinese stock prices are triggering margin calls from banks, whic. norwich city season ticket application Tung Sol 6SN7GTB dual triode preamp tube Super linearity, low noise, and full performance ratings make this one of the best 6SN7 tubes ever made. FREE delivery Jun 14 - 17. Schiit Freya Plus can accommodate any 6N8S, 6SN7, or 5692 tubes. Same tube as 6SN7, 6SL7. 99 In Stock! NOS Tubes Precision Tested and Ready to Ship! Bruce Rozenblit's "grounded grid" preamp (not public domain) Also, you can go with the tried and true "buffered voltage amp," or a variation of it, and get really quite good results. Oct 16, 2018 · These tubes have incredible air, image, "rosin-on-the-bow" realism, and powerful yet accurate bass. Its mu of 20 is a nice compromise between the old low-mu types and low-current high mu types. This means you want the highest quality sound being sent from the preamp to the amp. 00 and change from AES!!! They are pristine new-in-box JAN tubes, dated June 1943, with all the printing intact. Today, we're thrilled to introduce the Apos Ray 6SN7 Select Vacuum Tube, available for a limited time at an introductory price of $49 6SL7 TUBES CURRENTLY IN STOCK This page lists all of the 6SL7 tubes I currently have in stock, including all industrial and European versions. 12-13-2011 at 04:29pm. I recently also made a decission on which tube tester to buy after reading and looking at multiable testers I decieded on a B&K 747B the reasons I choose this tester 1 easy to calibrate 2 lightweight 3 solid state no calibration. The 6sn7 tube preamp is known for its ability to accurately reproduce the subtleties and nuances of the music, providing a truly immersive listening experience. 1000+ Head-Fier Joined Jun 22, 2019 Posts 1,110 Likes 2,709 Location London, United Kingdom [Thanks to @tintinsnowydog here is a consolidated list of tubes in this family] Inspired by The Reference 6SN7 Thread, I thought I'd start one for the 6J5 "family of tubes". In all my time playing with 6SN7-ish tubes in linestages I never ran into this. littleslvt [6SN7W / 6SN7A / 6180] 10000hrs minimum life. One of the primary functions of st. The 7193 is a spectacular tube, with airy highs that seem to float into the room, a nice warm midrange, and solid, tight bass. Tube rolling with my Prototype 6 or 12SN7 Preamp, a review of the Pre as well a first look at some New Tubes that just came in!Link to my online store: htt. New Sensor is an American corporation and since taking ownership of. The 6SN7 vacuum tube is a dual-triode preamp tube with medium gain. Though you might not have initially thought it, there's a lot more to it than just getting to a station, getting on a train and then getting off again. Nov 30, 2020 · Reviews of 6sn7/ECC32 vacuum tubes and equivalents. Overall, the sound could use some more "body" and fullness, especially in the midrange and wouldn. Any thought on this issue will be helpful. Very hot testing tubes with great gain, yet incredibly quiet. andyjevans said: Yes, I suppose that's the case. So please go to Tube Depot or TheTubeStore and buy from them--you'll save some money, and you'll also get to pick your exact tubes. Thoe make some of the best high-end tubes of the 6SN7 type, and generally they are pretty energetic and dynamic. 6SN7's in particular are great for preamp and head phone amps. As we all know 6SN7 is a double triode and for my design I will tie the two sections in parallel. Report an issue with this product or seller. also worth noting that psvane makes high end new. An example of audiophile pricing: I have a MFA "Venusian" preamp, a 3 chassis(!) Octal tube preamp. 01-01-2007 at 05:22pm Report Comment Delete. The tube heater is on all the time, in all modes, and leaving it powered on all the time will New Listing Vintage NOS 1950s Raytheon 6SN7GT 6SN7 Smoked Black Glass Black Plate Tube C $13 Top Rated Seller. I like the sound of the Slyvaina 6SL7GTB myself , i also have very nice sounding early Tungsol. cox com login You can also roll 6GU7s in that spot, and yes, they are basically a 6SN7 in a 9 pin bottle. I have 2 new what is considered by many the best 6sn7 tube ever tungsol black glass round plate Oval mica 6sn7gt tubes labeled for hyvac. Excellent driver tube in high-end audio applications but I have a lot of experience with original Tung Sol tubes, they are some of the best made of this type. Thus its tonal balance is kind of neutral. Many folks report that the sound quality rivals that of the best vintage 6SN7 tubes. Joined 2007. And the big round tennis ball shape tubes that the Chinese premium tube modes are doing will absolutely not fit. Looking to upgrade from the Electro-Harmonix. Digital sources rarely need any extra amplification, so you don't need a preamp. The soundstage reproduced by this 6SN7 tube by Tung-Sol resembles 5692 tube. 9vrms input versus 3 Not the same tube In a Hollywood twist ending, it turns out that the best 6SN7 is not a 6SN7 at all, it. Seattle Area #1. Westinghouse tall boys are 3rd but still a really solid choice. Today's new production 6SN7 tubes can handle max 450V. This one is a rare 1957 dated Raytheon 6SN7WGT. The soundstage reproduced by this 6SN7 tube by Tung-Sol resembles 5692 tube. The cleartops sound nice and balanced, but the best I've found IMO are the RCA blackplates with the center shield. It has been a while since the Schiit Audio crew got together for one of their blind listening tests conducted at a California retail location dubbed the Schiitr.
ly/Ray6SN7SA review of the Ray. The new balloon style size tubes that Linlai is doing will not fit. 1 tube 2x triodes per channel. The 22A3 amplifier uses these twin sections in parallel for both 6SL7 and 6SN7 tubes. andris February 2, 2021, 3:18am 1. sig p320 stippled grip module I'm working on one of these amps for a friend and seeing what I can do to improve it. Expert Advice On Improving Your Home Videos Latest View All. For the 6SN7 driver tube I also tried NOS Sylvana and RCA tube brands, and I found that I like the sound from Tung-Sol brand tubes the best. While they are not quite up to the reissue Gold Lion tubes to my ears, if looking for a reasonably priced new tube with good sound, the Tung-Sol reissue 6SN7 would be where I would place my $$. oxynorm mims May 10, 2020 · My 6SN7 experience is largely with Atma-Sphere and Berning amps and the A-S MP-1 preamp, a few years back. I find this combination (along with my amp's capacitors) gets a good balance of bass and treble extension, along with a very clear midrange I am looking forward to the 6SN7 V. There are two grades available - Low noise (A. I know there's all kinds of variables but I'm getting a new tube pre and it's extremely versatile in the different types of tubes it can use. I think 'Wavebourn' designed one a few years ago. punishedmosquito Neural tube defects are birth def. 00 In Stock! NOS Tubes Precision Tested and Ready to Ship! Yes, you are right, all 6080 tubes have a metal base - I meant the bakelite/plastic sub base, which is gray on the Sylvanias. The sound signature is on par with 5692 types. These tubes have incredible air, image, "rosin-on-the-bow" realism, and powerful yet accurate bass. One of the best 6SN7 tubes for sale. The sound signature is on par with 5692 types. EL34 Mullard is best.
Its mu of 20 is a nice compromise between the old low-mu types and low-current high mu types. More neutral compared to Sylvania or Tung-Sol VT-231. #R703 Sylvania 7N7/6SN7GTA angled (re-based NOS) $99. Perhaps the Tung Sol 6SN7 round plate is equal. 6P5GT RCA or Tung Sol are the most linear tube in this amp gain class (see plate curves) and a pair outperforms any 6SN7. These worked quite well in my Schiit Freya and of course, would work in a Schiit Saga and any other preamp you may. Neural tube defects are birth def. Pacasmayo, Thursday, 7:12 AM. Treatments for chronic bronchitis include medication, surgery, therapy and above all, lifestyle changes. When using 12AU7 and 12SN7, S3 onboard switch must be. Adapters to use in 6SN7 / 6SL7 sockets are not expensive. Arrives before Father's Day. Troubleshooting Help. This one would work well with a 6SN7. Tube: sophia 6sn7Retro-thermionic: "grace" 6sn7 tube sophia warranty grade year6sn7 tube. GTB is variant of GTA, with a heater warmer control to further enhance reliability when this tube was used in TVs. It is important to test these tubes with their sections in parallel before matching into pairs Very efficient speakers are required for running 45's for best. Our current stock are military pulls in white boxes. Paired (very close halves and both tubes are equal). The 7193 is a spectacular tube, with airy highs that seem to float into the room, a nice warm midrange, and solid, tight bass. If I get MELZ 6N8S 6SN7 Metal Base next week, then I will also include it in shootout. It is highly sought after by jazz-, blues, and rock guitarists owing to its low distortion and superb linearity. The plate resistance is low enough to drive choke or transformer loads. A Schiit Tube Shootout – 6SN7 Vs 6N1P. tucson craigslist for sale by owner This combination yields a warm, but quick and dynamic presentation. Other 6SN7 have too high distortion IMO. Very hot testing tubes with great gain, yet incredibly quiet. Sylvania 6SN7GT 2 Hole Bad Boy, Black Plates, Well Matched (9. Its mu of 20 is a nice compromise between the old low-mu types and low-current high mu types. A lot of extra bracing was added to improve shock resistance. My 1948 Raytheon 6SN7 tubes are about the same price now at Linai per AiiExpress. The Old Stock 6SN7s are reasonably priced unlike. Last edited: Jun 2, 2020 thomask Well-Known Member Joined: January 17, 2009. I recently bought an amp that uses 6sn7 and have been doing the required (extensive) research. I came across two tubes of one of the very best 6SN7's models that I've wanted to try, but normally tend to be relatively costly. More neutral compared to Sylvania or Tung-Sol VT-231. 1. rule34 website The 6P5 is an octal 76 and a very good sounding tube available in an ST bottle. Types of Replacement Tubes in Schiit Freya Plus. 11-04-2021 at 06:01am. I've been trying to go on a bit of a rolling spree to find my favorite 6SN7 tubes, and despite buying some tubes that are among the "best" (according to the "cools" on various forums), I've had some. This causes all sorts of pro. Based on what I have read on this and other threads, I decided to purchase a quad of KR Audio KT88 power tubes, 3 PSvane CV181-T mkii for the preamp section and 2 Tung Sol 6su7wgt rectifier tubes. Posted August 28, 2020 (edited) This is my collection of 6SN7 tubes for my Supratek Grange valve preamplifier. For gain tubes: 1) ken rad 6sn7 black or clear glass. The Tung-Sol 6SN7 preamp tube name and trademark have been acquired by the New Sensor Corporation. Very hot testing tubes with great gain, yet incredibly quiet. Here is the description of that Tesla 6SN7 or 6CC110 (google translate from Japanese to English) unused 6CC10 of TESLA still have not seen at auction overseas, is an exhibition of the same Rottopea. 1. In all my time playing with 6SN7-ish tubes in linestages I never ran into this. The GTBs I tried were from the 60s and. Our current stock are military pulls in white boxes. When we asked for your feedback about what tube we should make next, you voted overwhelmingly for a 6SN7 tube.