Re: High voltage pre amp design


Joe Kesselman wrote:
> Why do you want to do this? "An inexpensive op amp", in the right
> circuit, may be a perfectly decent gain element. Op amps are popular
> precisely because they are surprisingly effective component for their cost.
>
> (If you have to ask how to build a tube preamp, you probably don't know
> enough to meaningfully criticise the existing circuit.)

You have a point and and I should have expected such a response...

I feel that the Input stage is a weak link and would like to try tubes
in this area. I have built many circuits in the past and see this as
my next attempt at creativity.

To define my reasoning, the amps have a forward and reverse polarity
output and I felt that if I eliminated the op amp inverting the signal
and used the Jeff Rowland Balanced out as the inverter it would
eliminate or make better. I have already dupicated the input circuits
(less Gain stage) in the amps and tested them, hoping the Preamps gain
(8 to 12 volts) would be enough. Once I looked into a seperate gain
stage I began to think the Preamp should do this once. Why have a
duplicate circuit?

Thanks

Ed

.

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