Recent content by Tom-s
  1. Tom-s

    6SN7 Tube Addicts

    I knew it was a challenge as these are rarely discussed on these forums. All those thinking of a 5692. You were sort of right. It's very much based on the 5692 how i see it. This is a tube from 1954. It was made by Tesla in Czechoslovakia. Tesla 6CC1 (that later became 6CC10). It's close to...
  2. Tom-s

    6SN7 Tube Addicts

    No one's close as of yet. Thanks for playing along. Here's another picture. Showing two of them. No more hints after this one. It's a more rare tube. Seldom discussed on this forum.
  3. Tom-s

    6SN7 Tube Addicts

    Props for the knowledgable guys who can identify this one. Hint. It's call sign is not 6SN7. However it identifies as one on steroids. Is build like a tank and tests very similar.
  4. GEC A2900 ECC801s E81CC ECC81 12AT7 priced to sell

    I’m selling my small collection of GEC A2900 (a GEC special quality valve). The absolute king ECC81 / 12AT7 / E81CC / 6201 / ECC801s type tubes. The most sought after version of ECC81 tube and virtually unobtanium. Please mind some minor differences from a normal ECC81 type. They do function in...
  5. Tom-s

    Crack;Bottlehead OTL

    The greatest Bottlehead gateway drug is going on sale this weekend! Starting Sunday 15th. Have a look at the Bottlehead forum for more details. Can't wait for my next builds! Greeted by the top plates! Then comes the parts list for your Crack. And then the kit with all the small parts...
  6. Tom-s

    The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)

    The tube you have there could Raytheon. It’s from the 1930’s four pillar series. More often are these found in type 76. This is based on the mica seen. The bottom mica should be round with a metal lip over it on the side of the support pin. The plate however is not typical four pillar style as...
  7. Tom-s

    Darkvoice 336i & 336SE Tuberolling PartII

    It's possible to build it with 6SN7's from the start. For a first timer build i wouldn't recommend this. As this would void any warranty from the start. And has the risk of destroying the top plate in the process. Here's a sample build with 6SN7 as driver tube. I've done several and like the...
  8. Tom-s

    Crack;Bottlehead OTL

    There's very little Cracks with a bigger top chassis. Look into the Crack A Two A; as it was designed with a bigger top plate. To allow room for more fancy (big) output capacitors. The Bottlehead Stereomour amplifier uses 12AT7 tubes as drivers for the 2A3 power tubes with great succes. Half...
  9. Tom-s

    Bottlehead Amplifier Discussion / Comparison Thread: Crack, SEX & Mainline

    It's not correct what you state here. It does have a switch to allow a balanced output from the output transformer secondary windings. It can be run both balanced and as single ended. With the XLR output connect one can use both options via a switch.
  10. Tom-s

    The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)

    For me. This would be. Mullard. Brimar. Sylvania.
  11. Tom-s

    Crack;Bottlehead OTL

    These switch boards were made for my own personal use. I have a few spares available, as these PCB makes have a minimal order number. Let's continue via PM. Edit: build some BH bases today. 2x Crack. 1x Eros.
  12. Tom-s

    Crack;Bottlehead OTL

    Today I build a Crack. It's the one from last weeks pictures. I cheated the Hammerite dry times of 2-4 weeks by using the oven. So this morning I started the journey and am now enjoying the new build Crack! Leds lit. All checked out first time. And it's sounding great! Here it sits next to my...
  13. Tom-s

    Crack;Bottlehead OTL

    The Psvane CV181 is not a Mullard CV181. Electrically the Psvane is a 6SN7 and the Mullard is not. http://www.r-type.org/exhib/aad0139.htm So with the Psvane it will function exactly the same as any other 6SN7. No problems with any 6SN7 amplifier. The Mullard is electrically not a 6SN7 whatever...
  14. Tom-s

    L0rdGwyn's DIY Audio

    Could you point to some reading material @Tjj226 Angel . Most of what i've noted regarding that topic has to do with an even heating method for DHT's. From what i take away when reading posts about heaters (as on the EML/JAC websites). If it has a center tap. It's better to use it. The EC360 is...
  15. Tom-s

    ZMF Pendant by Ampsandsound; impressions, tube-rolling, and general discussions

    I can't completely understand why. http://tdsl.duncanamps.com/pdf/a2900.pdf https://frank.pocnet.net/sheets/093/1/12AT7.pdf The heater current is 0.4A vs 0.3A for a normal 12AT7. This minimal change in heater current should not make a change on an amplifier like the Pendant (with big 6.3V...
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