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Old 17th May 2013, 09:52 PM   #1
zman01 is offline zman01  Bangladesh
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Default KT77 for Tubelab SSE

Serach did not bring up much info, so creating a new thread.

Has anyone tried KT77 tubes in their Tubelab SSE?
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Old 20th May 2013, 08:43 PM   #2
rknize is offline rknize  United States
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I think I had my JJs in there at one point. They seemed to work fine, but I don't remember much more than that. I'd imagine they'd be in 6L6 territory.
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Old 21st May 2013, 07:23 PM   #3
zman01 is offline zman01  Bangladesh
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Default Been looking up on other choices too...

Thank you Russ.

In the meantime, a search for alternatives revealed another choice - read that the 6V6 tube sounds very nice in the SSE (nearly DHT like sound according to the Tubelab website?), but will need a lower B+ voltage vs the JJ EL34s I have in the amp now. Also understand that they will produce around 1.5 watts per channel, but I have 92dB efficient speakers and listen at moderate volumes, so maybe worth a try?

Looking up some older posts reveal that the new 6V6 tubes can be run at much higher B+ (~450v) that older makes which would be around 320v?

My amp has:

Power: Hammond 373BX - 350-0-350
OPTs: One Electron UBT-2, 4.8k primaries
Choke: Transcendar 10H, 200 mA, DC Resistance: 100 ohms

Btw, I did not measure the B+ of my SSE yet - after putting it together, it just worked. - now need to measure that if I fancy rolling with different tubes.

Last edited by zman01; 21st May 2013 at 07:35 PM.
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Old 21st May 2013, 08:08 PM   #4
rknize is offline rknize  United States
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Vintage 6V6GT tubes could take quite a bit of spec bending on the plate voltage. Many guitar amps took advantage of this and designed circuits that ran then well out of spec to get more power. When new production 6V6 tubes started coming out, they tended to fail when used in these circuits. Since then, New Sensor has come out with a few versions that can handle the extra B+. The Electroharmonix 6V6GT was one of the first to claim this. I think that TubeDepot calls these out on their site.

If you are running with a choke, you can drop the value of or eliminate C1 to reduce your final B+.
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Old 21st May 2013, 08:24 PM   #5
zman01 is offline zman01  Bangladesh
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I've looked up EH and Gold Lion tubes. The Gold Lion is supposed to sound better but costs quite a bit more too. No pain, no gain Recall reading that the Tung Sol 6V6 is robust at higher voltages and also sounds good, but the gain is less vs other tubes like JJs.
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Old 21st May 2013, 09:56 PM   #6
rknize is offline rknize  United States
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The EH and Tung-Sol are roughly the same tube from New Sensor. I have the latter in my amp, but it doesn't push the specs very hard. I didn't know that New Sensor had a "Gold Lion" 6V6 as well. They appear to have the same innards as the other two.

I don't know what is really different between all of their different re-issues. Some seem to think they have slightly different internal alignments, even though the plate structures are often exactly the same. Others think they use simple binning and stamp the best samples with Gold Lion. It's really hard to say.
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Old 29th May 2013, 03:38 PM   #7
Anchan is offline Anchan  United States
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Been running JJ 6v6's for well over a year at 430v. Not even a hiccup. Sound great.
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Old 29th May 2013, 07:16 PM   #8
zman01 is offline zman01  Bangladesh
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Thanks for your inputs Russ and Anchan - planning to try out a pair of EH 6V6 over the weekend.

In the meantime, the JJ EL34s are really sounding sweet...

p.s. Anchan, your PP amp with 2 x SSE boards and 6V6 tubes is an interesting project.

Last edited by zman01; 29th May 2013 at 07:19 PM.
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Old 12th June 2013, 07:11 PM   #9
zman01 is offline zman01  Bangladesh
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Finally got my B+ measured - 413v.

So that should be fine for the 6V6; however for EL34 is that too low?
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Old 13th June 2013, 12:33 AM   #10
Anchan is offline Anchan  United States
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Quote:
Originally Posted by zman01 View Post
Finally got my B+ measured - 413v.

So that should be fine for the 6V6; however for EL34 is that too low?
The Dynaco st70 ran at 420V with 34's, and I think they made 200000 of those suckers. You should be fine.
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