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-   -   buffer stage ECC88 or ECC83? (http://www.diyaudio.com/forums/tubes-valves/63090-buffer-stage-ecc88-ecc83.html)

KevinTams 24th August 2005 05:13 PM

buffer stage ECC88 or ECC83?
 
I'm going to build a buffer stage to go between the output of a TVC into my PPKT88. Reason is to account for eq I need to apply for my room/speakers.

I've got a few ECC88's and ECC83's sitting around looking bored, can anyone advise on a suitable circuit utilising either of these?

Kev

Alastair E 24th August 2005 08:15 PM

Buffer stage
 
a straightforward White-Cathode follower, using the ECC88/6DJ8 would be my choice, Lots of schemes about for the '88 The '83 tends to be a little more microphonic especially some brands!

EC8010 25th August 2005 11:10 PM

Do a search for SY's recent "Heretical line stage" thread...

KevinTams 26th August 2005 09:59 AM

Sorry Guys
I've just re-read my post and realised it isn't at all clear. :clown: By needing to compensate for equalistaion I will need some gain, around 9dB to be sure, and as far as I know cathode followers have a gain of a little less than 1 so these are no good.

Any suggestions for a stage with a small amount of gain preferably but not exclusively using ECC83's or 88's

Kev

Eli Duttman 27th August 2005 12:09 AM

Quote:

Any suggestions for a stage with a small amount of gain preferably but not exclusively using ECC83's or 88's
A couple of ideas. There are quite a few circuits around using the 12B4, a NICE tube with low mu. Build with the ECC99 or 5687 and use a 3:1 step down trafo at the O/P.

BTW, the trafo idea works with the 6922, but you still get 20+ dB. of gain. Perhaps, that's too much.


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