buffer stage ECC88 or ECC83?

[KevinTams]

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]

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]

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

 

[KevinTams]

Sorry Guys
I've just re-read my post and realised it isn't at all clear. 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]

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.