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Old 17th April 2009, 06:40 AM   #11
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Quote:
use some tube-mosfet darlington.
You can only do that if either (a) the tube takes grid current with the mosfet source-follower feeding its grid, or (b) the mosfet takes gate current, with a cathode follower feeding its gate. Which way round is it?
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Old 17th April 2009, 06:44 AM   #12
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Quote:
Originally posted by ray_moth


You can only do that if either (a) the tube takes grid current with the mosfet source-follower feeding its grid, or (b) the mosfet takes gate current, with a cathode follower feeding its gate. Which way round is it?
Mosfet takes voltage drop caused by cathode current on resistor.
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Old 17th April 2009, 02:59 PM   #13
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Something that holds up in guitar amp use/tube abuse should do fine in a hi fi setup. Now how it sounds it another matter all together and that'll require some experimentation to find what YOU like best. I've used that new Russian TungSol 6L6STR at 450volts in a Super Reverb combo that I fixed up for a customer for some time now with excellent results. They seem to be reliable and non microphonic.
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Old 17th April 2009, 03:18 PM   #14
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Note that the 6P3S-E only has 22w plates
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Old 17th April 2009, 04:08 PM   #15
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Quote:
You can only do that if either (a) the tube takes grid current with the mosfet source-follower feeding its grid, or (b) the mosfet takes gate current, with a cathode follower feeding its gate. Which way round is it?

Mosfet takes voltage drop caused by cathode current on resistor.

That one works the best for me. Also possible, Bipolar transistor takes base current from tubes cathode. I tried both, but the mosfet measured and sounded better.
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Old 6th August 2009, 12:14 AM   #16
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guys


Got a chance to pick some of these up cheaply from a local:

TOSHIBA 6L6/GC 1
GENERAL ELECTRIC 6L6-GC 1
HITACHI 6L6 GC 1

RAYTHEON 6V6 GTY 1
U.S.A. 6V6 GT 1
RAYTHEON 6V6GTA 1


Which ones would/wouldn't you recommend? (just for future projects, supply here is extremely limited)
(shame there are no pairs, I've already got one 6L6G GE).
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Old 6th August 2009, 12:56 AM   #17
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Exact pairings matter little to SE or SEPP. I'd take the whole batch.
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Old 6th August 2009, 01:17 AM   #18
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yes I might just do that, especially as I'm getting them all for about 25 USD.

Just got 32 very nice tubes from him so I know there all good. They were from a local radio repair shop. All in original boxes.
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Old 7th August 2009, 05:53 AM   #19
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I don't get it. I use 5881's in lieu of 6L6's and the former can take higher B+. It can't all be down to cost but do other members find 6L6's better than 5881's as they are essentially same plug-ins?
I know that 6L6's were made in greater quantity but is there another reason ?

richy
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Old 7th August 2009, 10:04 AM   #20
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The valves sold today as 5881 are usually Reflektor 6P3S-E.

Originally, the 5881 was a Tung-Sol development aimed as an improvement on the 6L6G (not GC). The anode and screen ratings were upped to 400V, and anode dissipation increased to 23W. Stiffer internal structure makes a tougher valve.

The 6L6GC was introduced to further the improvement over 6L6G to 500V anode, 450V screen.

The 5881 specs are very similar to the proper Reflektor 6P3S-E, and I expect that is why the Sovtek branded items use that designation.

In the guitar amp world, the 5881/6P3S-E is known for tough and reliable service, even when its (voltage) specs are exceeded. And a relatively good price. But the sound is often regarded as less refined than the various versions of more expensive 6L6GC.

As for comparisons of NOS, I don't think there's enough 5881s left to make the discussion worth having.
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