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Selecting an output tube . . .
Selecting an output tube . . .
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Old 29th May 2019, 02:09 PM   #91
mondogenerator is offline mondogenerator  England
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And if I were you...

I'd leave in the EL37 and forget 6L6 altogether if they're in good nick.

Or sell the EL37.

(I recently came across a pair of EL37 and KT61 and will probably sell them rather than build a mono block)
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Old 29th May 2019, 11:14 PM   #92
Plimpington2 is offline Plimpington2
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I suspect you are right. I’m not a fan of the chromed chassis, and so intend to build the whole thing into the chassis I prefer. Excited about this!!
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Old 1st June 2019, 01:16 AM   #93
wg_ski is offline wg_ski  United States
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Looking at the data sheets for the 7591 there doesn’t seem to be any kink below 100 volts plate at low current, like the 6L6 and all the bigger ones seem to have. Would that tend to make it more well behaved than a 6L6 at high Ra loads? Was it a selling point back in the day? Or does it get just as kinky at Vg below -16 (where the curves stop)?
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Old 1st June 2019, 02:08 AM   #94
6A3sUMMER is offline 6A3sUMMER  United States
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Sometimes those kinks do not get in the way.
What is the worry . . .
Draw a proper Load Line, and see how hard it is to be in a kinky area.
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Old 1st June 2019, 03:35 AM   #95
wg_ski is offline wg_ski  United States
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Woofer with a high Qms might push it there (at resonance). 6L6’s *are* cheaper, just trying to determine if there are reasons why the 7591’s would be preferable with 10k trafos. I’ve got a pair from an unknown source that could use a home.
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Old 1st June 2019, 04:33 AM   #96
6A3sUMMER is offline 6A3sUMMER  United States
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wg_ski,

Good point!

Push Pull transformers have lots of primary inductance.
So a high QMs woofer might be a problem with a kinky tube.

However,
Single Ended transformers do not have nearly as much inductance.
The plate current can not go low at low frequencies,
and so might not push you into the kink.

"All Generalizations have exceptions" - Me

Last edited by 6A3sUMMER; 1st June 2019 at 04:38 AM.
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Old 1st June 2019, 06:20 AM   #97
H713 is offline H713  United States
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Quote:
Originally Posted by Plimpington2 View Post
PROBLEM SOLVED!! I have happened across a “Knight Basic 60 Watt Amplifier. This is coming complete with Mullard EL-37’s. I am told this is essentially the Mullard 5-20 circuit and can be built with 6L6GC. Which seems reasonable. IF I decide to actually use these Millard’s, I’ll probably build it into my Rauland chassis which will show off the tubes, choke and big TOBE cans better.

I wouldn't design a new circuit around EL37s. They aren't too easy to find, so future maintenance could be an issue when they get even rarer.
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