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Re: Replacement diodes [message #23136 is a reply to message #23130]

Thu, 18 June 2015 11:28

stevem is currently offline

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

You could install the most massive filter caps in the world and still those diodes would only get smaked with the same amount of current that the power transformer can pump out like when the amp is up full tilt!
That 1.5 volts across the speaker output should be making for a big hum out of the speaker no?
In regards to this problem here are some things to check.
1) how well balanced is the + and - voltage across each main filter?
Are all the 4 output transistors still the original matched set of RCA brand?
The resistors on the output transistors need to be checked to see how far they have drifted, in fact by the time you have unsoldered one end of each to check them, you should just replace them with 1% tolerance ones.
The big 5 watt ones can be 10 % but buy 5 or 6 of them so you can use 2 of the closest matched ones and up the wattage of the replacements from 5 watt to 7 or even 10 watt.
I have found that small differences from the schematic called for values of these resistors will knock 35 watts off of the amps output and the imbalance will make the amp run hot!

In regards to the diodes once again you can help them and take some switching noise hash out of the amp by wiring a .01uf 400 volt ciraimic cap across each diode if you care to.

[Updated on: Thu, 18 June 2015 11:31]

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[Message index]

		Replacement diodes By: bluezebra on Thu, 18 June 2015 00:22
		Re: Replacement diodes By: chicagobill on Thu, 18 June 2015 02:12
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 02:26
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 06:09
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 10:46
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 11:28
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 11:42
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 13:09
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 13:13
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 13:23
		Re: Replacement diodes By: chicagobill on Thu, 18 June 2015 17:55
		Re: Replacement diodes By: stevem on Thu, 18 June 2015 19:37
		Re: Replacement diodes By: bluezebra on Thu, 18 June 2015 22:21
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 01:22
		Re: Replacement diodes By: stevem on Fri, 19 June 2015 06:33
		Re: Replacement diodes By: pleat on Fri, 19 June 2015 07:06
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 09:52
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 12:54
		Re: Replacement diodes By: stevem on Fri, 19 June 2015 18:43
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 20:28
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 20:41
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 21:11
		Re: Replacement diodes By: chicagobill on Fri, 19 June 2015 22:11
		Re: Replacement diodes By: bluezebra on Fri, 19 June 2015 22:19
		Re: Replacement diodes By: chicagobill on Sat, 20 June 2015 02:29
		Re: Replacement diodes By: stevem on Sat, 20 June 2015 06:11
		Re: Replacement diodes By: chicagobill on Sat, 20 June 2015 11:08
		Re: Replacement diodes By: stevem on Sat, 20 June 2015 15:32
		Re: Replacement diodes By: bluezebra on Sat, 20 June 2015 21:03

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