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Oldskoolfan's latest activity
Oldskoolfan
liked
TimD's post
in the thread
Are the days of cheap 400/700s done.
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You can do it with an active inverter as well - no need for a transformer. Most amps that support bridging internally use a simple...
Jul 6, 2025
Oldskoolfan
replied to the thread
Are the days of cheap 400/700s done.
.
The transformer is an option i've explored but to do both channels would require 2 amps and 2 transformers ... I think... :munky2: I was...
Jul 6, 2025
Oldskoolfan
liked
Dnspy007's post
in the thread
My First WOPL 400 Series 2 Build
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This as far as I could get for now.. Ordered some 2 hole ground lugs for the caps. Should be here this week sometime. Gives me time to...
Jul 5, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
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That 470uf, 100v cap seems...large as a replacement upgrade for C6, a 100uf, 6.3v cap. What say ye? I have smaller. Help!
Jul 3, 2025
Oldskoolfan
liked
Gepetto's post
in the thread
Sweet Linda came home today.
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Yes
Jul 2, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
.
Just to be clear, the diodes are paralleled across C6, cathode to anode?
Jul 2, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
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Yes, bias is good. Both trimmers are at about 60% of travel. Bias is more stable as well. Has about +/- .1 millivolt after stabilizing...
Jul 2, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
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Joe, are the diodes installed anode to anode or cathode to cathode across C6?
Jul 2, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
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Well, I ordered the 470uf caps and the 1N4148 diodes. I started reading through the tips and archives. Discovered people are...
Jun 27, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
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Got a pic of how you installed the diodes? Not a lot of room on the back of the board.
Jun 27, 2025
Oldskoolfan
liked
Gepetto's post
in the thread
Bipolar transistor grading
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My translation of that quote is "never do a bad job good"
Jun 27, 2025
Oldskoolfan
liked
oldphaser's post
in the thread
Bipolar transistor grading
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The link above no longer works. I found a new link: http://ijfritz.byethost4.com/MiscProj/transmat001.pdf?i=1 and an archived copy at...
Jun 27, 2025
Oldskoolfan
liked
Gepetto's post
in the thread
Sweet Linda came home today.
.
The diodes prevent the early board design from going into latch up.
Jun 27, 2025
Oldskoolfan
replied to the thread
Sweet Linda came home today.
.
This is the mod to prevent the amp from going into oscillation? I remember reading about this.
Jun 26, 2025
Oldskoolfan
liked
Skratch's post
in the thread
Sweet Linda came home today.
.
You should change C6 to 470uf and put back to back diodes across it 1n4148
Jun 26, 2025
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