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#1,581
Bonsai said:
Good Result OStripper - I know you have been working on this for a few months but finally its come together. From what you say, it measures well, and I hope it sounds as good too.
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Thanks , B ....

I haven't commented much on my subjective opinion as it would not be worth much anyways. What I will say is that it is REAL and VERY loud. Tapped the voice coils on 2 paralleled 15" pioneer woofers per channel then I turned it down. Does 100v P/P with the greatest of ease. into a 8R load scoped 130v p/p for a short while. PS did not even get warm , I think it would support an even larger amp.

What is so nice, I will be able to let my AX "blameless"(BELOW 1) "spread it's wings" on this power plant ... also have a pair of the blameless that are like DX's "blame ES" (BX)to see if they have any sonic merit. (BELOW 2)

SOOOO cool .. a true DIY'ers amp. 😀

OS
 

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#1,582
AndrewT said:
if these go together then that is just 13% losses from fully charged PSU to Maximum output voltage. That's a good result. Now see what short term voltage it can pass to 2r6. This will indicate how well it meets current demand.
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I don't think my OPS could handle 2.6R at that level sustained , andrew. My SOA is not sufficient at those levels. Maybe in the future I will build a 4 pair MOSFET power board to really load that PSU.
OS
 
#1,583
ostripper said:
I don't think my OPS could handle 2.6R at that level sustained , andrew. My SOA is not sufficient at those levels. Maybe in the future I will build a 4 pair MOSFET power board to really load that PSU.
OS
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that surprises me.

An 8ohm capable amplifier must be able to drive an 8ohm speaker.
The stress of driving an 8ohm amplifier is similar to driving a 2r6 resistor.

I see that Bob Cordell also uses the three times rule for what he has termed Ireserve.

If your amp cannot survive a few seconds into one third of rated resistive loading then in my opinion it cannot be rated correctly in the first place.

BTW,
a few seconds is sufficient to pull down the PSU to full sag and to pass what is effectively a continuous sinewave test signal while the output stage is still fairly close to normal operating temperature. Do Not let the output or driver devices get hot! That may over-stress the amplifier into a 2r6 resistive load.

PS.
have you used Bensen's spreadsheet to assess the de-rated SOAR for your output stage?
 
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#1,584
Uhhhh... huh ?? Pictures.
Have a whole bunch of them , many pictures. Here is one..
Will stuff these today. We can comment on a picture ,huh?
Andrew T. will request a move of a few posts to "mongrel folder".. they would be more useful there.

Edit : to comment on a build will enrich the DIY'er with much knowledge to bring his success "up to par" , I have gained
skills and techniques by asking on this thread "how did you"?? or (where/why).


OS
 

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#1,593
#1,600
Recently finished voltage amplifier.

I've finished an opamp to drive my SE class A mosfet amp. I just wanted to share a beautifull pic 😀 The diagram is only in my head. The TL082 and elco's perform just aswell as a BB opa2228 and MKT/MKP caps. With the pot's I an set the desired gain. It is made a non inverting amp.

Together with the mosfet amp I have put it in an equalizer.
 

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