John, Actually the distorted crackle noise from the guitar can't be heard at low volume and you can only hear it once it is turned up. I will check it again...
363
john
johnx66uk2003
Jan 1, 2010 11:57 pm
Hi Larry. A happy new year from across the pond. I hope you had a great Christmas. My initial guess is that the power output transistors have failed. They are...
364
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365
john
johnx66uk2003
Jan 2, 2010 12:55 pm
Hi Larry. On drawing 19334. first check you have + and - 36 volts measured between the test points and ground. Next measure the voltage between speaker +...
366
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Jan 13, 2010 10:13 pm
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mrmtnhiker
Jan 15, 2010 2:33 am
Hi John, Happy New Year to you too. I posted two pictures in the Photos section, please see them at "Ric Amp Circuit Board". I need to get the circuit board...
373
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john
johnx66uk2003
Jan 15, 2010 7:47 pm
Hi Larry. Can you look at the outside of the amplifier and see if there are any screws coming through the case and into the large heat sink. The transistors...
375
john
johnx66uk2003
Jan 15, 2010 8:11 pm
Hi Larry, I think the tie raps are holding the main capacitors on the board but can't be 100% sure so don't cut them for now. Can you take a straight on photo...
376
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mrmtnhiker
Jan 18, 2010 8:02 am
Hi John, It has two NTE393 transistors and one tests bad. Now to find a store in Southern California that sells these so I don't have to mail order. Thanks, ...
384
john
johnx66uk2003
Jan 18, 2010 12:55 pm
Hi Larry, I could not find NTE393 on my drawing, perhaps yours is a newer model, but congratulations on finding the fault. Good luck with the repair, please...
385
mrmtnhiker
Jan 18, 2010 6:14 pm
Hi John, It did look like both the power transistors had been replaced in the past. Maybe the NTE393s are the wrong components. Do you see that it calls for...
386
john
johnx66uk2003
Jan 18, 2010 8:24 pm
Hi Larry. The drawing I have is for the RB60, RG60 and RG90. Can you take a photo of your amp showing the large heatsink(s) and how the transistors are...
387
Paul
paulxbe
Jan 18, 2010 9:27 pm
Hi Larry, I just picked up on this thread, a quick "Dogpile" (or Goggle) showed me that the NTE393 might be an equivelent to the TIP2955, and that the NTE392...
388
elec_instrument_repai...
Jan 18, 2010 9:39 pm
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389
Paul
paulxbe
Jan 18, 2010 9:40 pm
Hi Larry, I just found the schematic on schematicx.com, and I now see how it is connected, the output pair are a compound Darlington arrangement, with the PNP...
390
john
johnx66uk2003
Jan 18, 2010 10:06 pm
Hi Paul. Thanks for your input, I have just posted the RB60 schematic to the files section. Nice to see someone else alive here. It seems someone may have got...
391
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maldonado_s2001
Jan 19, 2010 1:55 am
Guys, I have this Marshall very little output. Don't know where to start. All the Pots are all the way up and i barely get a peep. all the components look...
393
mrmtnhiker
Jan 19, 2010 4:54 am
John, OK so the schematic calls for a TIP35C and a TIP36C in the Q11 and Q12 locations you mentioned and I where I found the NTE parts. This I will pursue now...
394
john
johnx66uk2003
Jan 19, 2010 10:29 am
Hi Larry. It would be good if you could use the original types. Did you manage to download the diagram from the files section. It will come in handy for the...
395
mrmtnhiker
Jan 19, 2010 7:28 pm
Hi John, Yes I printed out the schematic back when you posted the link to it in your message #348. Thanks, Larry...
