That Lotas is perfect
thanks so much
zzpkcq@gmail.com
GT
Last Activity: Yesterday, 05:02 AM
Joined: 05-08-2024
Location: GLOUCESTER
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Looking for a schematic for a Marshal G25R guitar amp
Looking for a schematic for a Marshal G25R guitar amp.
(it's actually a Park amp)... -
Can’t find a D suffixed one on Mouser site so what to order a replacement- any advice would be welcome
I’m always looking to learn something.
thanks...Leave a comment:
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Shou have said - looking on Mouser for replacements...Leave a comment:
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The guitar amp has no output - there’s no shorts on the board and I’ve tested as much as I can in terms of components on the board being open circuit - none found
so change the three JRC072D op-amps maybe affect something. Thus the question about what replaces the D suffixed op-amp with what suffixed tl072xx op amp as I can’t find a D tl one
what’s you thoughts...Leave a comment:
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Confused - I don’t want to order wrong thing
Going to replace op-amps in a guitar amp jcr072d
so TI versions have suffix D IP etc. There didn’t seem to be an explanation of these anywhere. I think they indicate the physical pin characteristics but what do they represent- anyone have a list. -
Some pics of the board to help identify it
Anyone suggest what to look at first.
I've satisfied myself transformer and rectified power is ok and can trace signal input from jack to first component.
I have multimeter, oscilloscope and bench power supply to help diagnose problems + can solder and unsolder components. So where to look first, schematic would help.
thanks in advance
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Thanks for the reply CapLeaker
But (there’s always a but) that schematic doesn’t seem right as it has less op-amps and more transistors than the bass version of this amp has. Another clue is this has a gain pot where the one I’m looking for has none.
tough ask I know that’s why I turned to BadCaps 👍Leave a comment:
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Squire bass guitar amp PB 15 no sound
Looking for a schematic for this amp to help solve no output problem.
Power input ok no shorts, signal tracing for me is why I could do with a schematic.
thanks in advance... -
Here goes
Some personal stuff
I’m a retired software engineer from the West Country of England. Since retiring I’ve filled my time with: playing and building guitars, cycling. Working for charity (with a bunch of likeminded people at Men in Sheds organisation).
I love tinkering with stuff and have a shed where I freeze in winter and sweat in the summer but manage to fix stuff with a little help from YouTube and nouse.
lately I’ve been turning my hand to fixing guitar amps for the charity I visit to entertain - they get musical instruments donated,...Leave a comment:
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