Folsom DIY7297 Amp & Antipole PSU - Page 16

Destroyer OS · 21st February 2018, 04:11 PM

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.

wcwc · 21st February 2018, 05:49 PM

What is the gain of the amp?

soldersmoker · 21st February 2018, 07:11 PM

Quote:

Originally Posted by Destroyer OS

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.

Destroyer OS · 21st February 2018, 11:09 PM

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.

dmy · 23rd February 2018, 04:58 AM

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

cspirou · 23rd February 2018, 05:31 AM

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.

Destroyer OS · 23rd February 2018, 06:10 AM

You can search for another D45 with the same specs. And as cspirou says. the diodes are not required.

Destroyer OS · 23rd February 2018, 08:25 PM

Teaser

limits · 23rd February 2018, 08:34 PM

Duracellzilla amp, Jeremy?

sorinv · 23rd February 2018, 08:42 PM

Let me guess ... phono stage + preamp?

21st February 2018, 04:11 PM	#151
Destroyer OS diyAudio Member Join Date: Nov 2005 Location: PNW	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. __________________ EC7293 60/120w Error Correcting Amp Folsom LOFI , DCS1 & DCS2

21st February 2018, 11:09 PM	#154
Destroyer OS diyAudio Member Join Date: Nov 2005 Location: PNW	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. __________________ EC7293 60/120w Error Correcting Amp Folsom LOFI , DCS1 & DCS2

23rd February 2018, 06:10 AM	#157
Destroyer OS diyAudio Member Join Date: Nov 2005 Location: PNW	You can search for another D45 with the same specs. And as cspirou says. the diodes are not required. __________________ EC7293 60/120w Error Correcting Amp Folsom LOFI , DCS1 & DCS2

23rd February 2018, 08:25 PM	#158
Destroyer OS diyAudio Member Join Date: Nov 2005 Location: PNW	Teaser __________________ EC7293 60/120w Error Correcting Amp Folsom LOFI , DCS1 & DCS2

23rd February 2018, 08:34 PM	#159
limits diyAudio Member Join Date: Aug 2008	Teaser Duracellzilla amp, Jeremy?


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21st February 2018, 05:49 PM	#152
wcwc diyAudio Member Join Date: Oct 2011	What is the gain of the amp?

23rd February 2018, 04:58 AM	#155
dmy diyAudio Member Join Date: Aug 2009	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

23rd February 2018, 05:31 AM	#156
cspirou diyAudio Member Join Date: Aug 2014	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.

23rd February 2018, 08:42 PM	#160
sorinv diyAudio Member Join Date: Mar 2016	Let me guess ... phono stage + preamp?

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