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In Reply to: RE: Most recent Acoustat upgrade posted by dogwan on July 27, 2014 at 11:12:42
I understand them caps are very good in the servo amps.
I ended up picking up some huge Dearborn P/O caps, had to mount them under.
What brand are your 4 black caps at the front that you replaced.
Going to be some more upgrading in the very near future.
Follow Ups:
Those are F&T caps (80uf/450v) that Mr. Savuto put in when he did my 1st round of upgrades.
Next thing I want to do is replace all the HV resistors. But, those are expensive and hard to find in the right values. I think Analogue Associates uses Caddock MG series.
Thanks for the info.
Did you upgrade the OP-amp or did Mike do it.
I know you have done some of the work yourself, but if remember right, Mike did some to?
Mike did that. It actually looks pretty simple with just a couple of caps and TO-99 style op-amps (can't remember off top of head which ones). But, looks can be deceiving. Parts of the original OP-11 operated the auto turn-on circuit which is no longer used and a number of other parts in that circuit were removed.
Thanks.
I will look forward to some upgrades.
I'll post some pics in the fall!
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