Posted by Gordon Rankin (M) on June 18, 2004 at 13:43:15

In Reply to: Re: Simple 84 posted by MQracing on June 18, 2004 at 13:18:22:

Mikey,

In regards to the cap, if people are cap coupling then they proabably have at least 3-4 which would be fine. No one is leaving a HV dc path to an RCA so in almost all cases this would be ok. I do know a tube maker who only uses 0.5uf considering that the input to the amp a high 100K. For them they would have to up the output cap.

::::You could make this an integrated by subbing in a Transformer Vol control with +6dB of gain.::::

speaking of gain. won't this amp require some additional gain (i.e., an active preamp) or use of a TVC set up for gain?

~~~~~~~~ 4VAC is the maximum input needed! That's why it soo cool!

If you went straight in with a cd output... say it was two volts and then the 173 steps up that voltage by a factor of two... you would only have four volts to drive the grid of the EL-84 and wouldn't get full output (would ya)?

YEP!

And to keep costs down (plus I'm not sold on TVC's)... what if you had an additional (optional) gain stage in front of the EXO-173... say for guys with passive pre's or guys who would want to come off of their cd player output only (with perhaps a vol control on the amp side)....

You could do what you want or better yet get a digital source with a good output and vol control and you would be better off.

THE LESS STAGES THE BETTER I ALWAYS SAY.

There is a beer with my name on it somewhere!

Thanks
Gordon

J. Gordon Rankin