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Singlepower 6528

post #1 of 30
Thread Starter 
Has anyone heard this amp yet?

Earl,I know you have one of your existing amps with Mikhail being modified to take the 6528 tube.
post #2 of 30
I should be getting mine any day now . Actually my amp will be able to use about 6-7 different output tube types but the 6528s will likely be the primary output tube I use.
post #3 of 30
Quote:
Originally Posted by tkam View Post
I should be getting mine any day now . Actually my amp will be able to use about 6-7 different output tube types but the 6528s will likely be the primary output tube I use.
6AS7/2399/5998/6080/6336/6520/6528/7236/7802.


My amp sounded awesome with the 5998 and senn 600's. I have never heard a 6AS7 or variant sound this clean and clear. Moreover, the senns have never exhibited this much bass control.

..... aint she purty???





post #4 of 30
Thread Starter 
Quote:
Originally Posted by sacd lover View Post
6AS7/2399/5998/6080/6336/6520/6528/7236/7802.
And 421A's
post #5 of 30
Quote:
Originally Posted by Rob N View Post
And 421A's
Actually, the 421A is another designation for the 5998. Classier sounding, though
post #6 of 30
My MPX3 SE should be upgraded and here soon, I'm going to try out some 7802s first.
post #7 of 30
Thread Starter 
So Earl's has a single input tube with a pair of 6528's for output.

tkam's 2 box one has the following:-

1st gain stage: 2 x 6sn7 (or 6414 w/ ecc adapters)
2nd gain stage: 2 x 6bl7
output stage: 2x 6528 (or 6AS7/2399/5998/6080/6336/6520/7236/7802)

I believe tkam's one will also have speaker connections.

What difference does having the extra 6BL7 gain stage make?
post #8 of 30
What mods to the SLAM SE are required for this?
post #9 of 30
Let's see.. Filament transformers (or in the very least an extra thransformer) as those things take 5 amps of heater current EACH!!! So a pair would just be about maxing out a Supra transformer. If you want to do it right I'd probably put in another gain stage, but maybe he'll be able to go without one. I'd definitely go with a filament transformer though. Moreover the circuit has to be redesigned to take the 6528s, so you're better off just getting a new amp (which is what he'd have to do anyways).
post #10 of 30
So, not likely to happen

How is hungrych having his modded to take these tubes?
post #11 of 30
Quote:
Originally Posted by Rob N View Post

What difference does having the extra 6BL7 gain stage make?

More overall gain for the 6528 is my understanding. Because the requirements for an integrated and headamp are quite different. After much experimentation he decided the single 6414 for gain worked perfectly in a headamp. But as an integrated the 6528 needs more current drive.
post #12 of 30
Thread Starter 
Quote:
Originally Posted by sacd lover View Post
More overall gain for the 6528 is my understanding. Because the requirements for an integrated and headamp are quite different. After much experimentation he decided the single 6414 for gain worked perfectly in a headamp. But as an integrated the 6528 needs more current drive.
So is this also why tkam's amp needs two 6sn7's and 6BL7 rather than the one 6414 that your amp has? I presume you can still use a 6SN7 in yours?
post #13 of 30
Is it just me or does anyone else LOVE the look of Earls old-school "toaster" Singlepower amps? Totally unique and retro. Kinda reminds me of something from an old Frankenstein flick. Sweet.
post #14 of 30
Quote:
Originally Posted by Rob N View Post
So is this also why tkam's amp needs two 6sn7's and 6BL7 rather than the one 6414 that your amp has? I presume you can still use a 6SN7 in yours?
Yes .... I think so.

As for the 6sn7, I did, in fact, try a 6gu7 = gain of 17 vs gain of 20 for the 6sn7gt. I have a high gain source and I had the stepped at exactly 12:00. When I tried the amp with the 6gu7 on a lower output Eastsound E5 .... I set the stepped at 1:00-1:30. So .... I think you will be able to use most any gain tube unless your source has a very low output level.
post #15 of 30
Quote:
Originally Posted by KenW View Post
Is it just me or does anyone else LOVE the look of Earls old-school "toaster" Singlepower amps? Totally unique and retro. Kinda reminds me of something from an old Frankenstein flick. Sweet.
Me too obviously. But the amp L KS especially C L with those big 5998 output tubes.
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