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Old 21st February 2018, 04:11 PM   #151
Destroyer OS is offline Destroyer OS  United States
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Folsom DIY7297 Amp & Antipole PSU
Sadly the amps gain is not adjustable. That has made it a poor pairing for several tube preamps.

I can tell you that I have had it on a few 96db speakers without issue. The preamps in those cases were ModWright and DartZheel.
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Old 21st February 2018, 05:49 PM   #152
wcwc is offline wcwc  United States
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What is the gain of the amp?
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Old 21st February 2018, 07:11 PM   #153
soldersmoker is offline soldersmoker  United States
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Folsom DIY7297 Amp & Antipole PSU
Quote:
Originally Posted by Destroyer OS View Post
Sadly the amps gain is not adjustable. That has made it a poor pairing for several tube preamps.
Thanks for letting me know. I should have done a better job of taking into account preamp/amp matching beforehand. But I can live with the sound as-is for now. It's actually a very satisfying amplifier in most aspects. Hopefully less gain in the replaced tubes of the preamp will solve the problem. I'll report back on how that works out.
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Old 21st February 2018, 11:09 PM   #154
Destroyer OS is offline Destroyer OS  United States
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32db

I recently tried something. I made a hole between my output binding posts. A slot would work too. NO reason to destroy existing binding hole posts or anything nutty; it just means that there is an open path between the two without the case fully blocking them. It does seem to help a bit with SQ.
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Old 23rd February 2018, 04:58 AM   #155
dmy is offline dmy  United States
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Just received the amp board. Thanks

I am ordering the parts now from Mouser. They are out of the D45H11G bipolar transistor.
Is there a substitute for it?

On the pcb, there are 2 diodes (1n400x) shown but the part list does not include them, are these diodes required?

Many thanks
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Old 23rd February 2018, 05:31 AM   #156
cspirou is offline cspirou  United States
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The manual explains what the diodes are for. Its mainly if you want to experiment and it's for protection against overvoltage. In the stock configuration they are not needed.

I bought most of my parts from Arrow and they had the transistor.
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Old 23rd February 2018, 06:10 AM   #157
Destroyer OS is offline Destroyer OS  United States
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You can search for another D45 with the same specs. And as cspirou says. the diodes are not required.
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Old 23rd February 2018, 08:25 PM   #158
Destroyer OS is offline Destroyer OS  United States
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Teaser

Click the image to open in full size.
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Old 23rd February 2018, 08:34 PM   #159
limits is offline limits  United States
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Thumbs up Teaser

Duracellzilla amp, Jeremy?
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Old 23rd February 2018, 08:42 PM   #160
sorinv is offline sorinv  Romania
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Let me guess ... phono stage + preamp?
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