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Re: Kustom Bass III Channel 1 Hiss [message #28700 is a reply to message #28683]

Sun, 24 July 2022 18:48

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

I'm not familiar with this circuit, but let me ask a few questions to get up to speed on what was done.

All of the transistors, resistors and caps have been replaced. The 739 chip has been replaced with a modern adapter board that has a modern 8 pin chip on it. Changing all of this so far has restored the channel to pass signal and to stop the hum.

When the adapter board was installed, were all of the old compensation parts removed from the circuit?

When the resistors were replaced, what kind of resistors were used as replacements? I noticed on the schematic that there are a lot of 1% resistors specified. This is a common Kustom engineering trick that puts metal film resistors in the circuit to reduce noise and hiss.

Do the volume and clarity controls change the character of the his when they are rotated?

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[Message index]

		Kustom Bass III Channel 1 Hiss By: thespeakerport on Thu, 21 July 2022 22:11
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Fri, 22 July 2022 05:58
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Fri, 22 July 2022 10:03
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Fri, 22 July 2022 11:27
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Fri, 22 July 2022 12:48
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Fri, 22 July 2022 16:58
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Fri, 22 July 2022 23:58
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Sat, 23 July 2022 06:16
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Sat, 23 July 2022 07:47
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Sat, 23 July 2022 17:38
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Sun, 24 July 2022 06:16
		Re: Kustom Bass III Channel 1 Hiss By: chicagobill on Sun, 24 July 2022 18:48
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Fri, 29 July 2022 14:43
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Fri, 29 July 2022 14:44
		Re: Kustom Bass III Channel 1 Hiss By: chicagobill on Fri, 29 July 2022 18:36
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Fri, 05 August 2022 11:46
		Re: Kustom Bass III Channel 1 Hiss By: chicagobill on Fri, 05 August 2022 12:57
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Fri, 05 August 2022 14:17
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Tue, 09 August 2022 18:27
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Tue, 09 August 2022 18:40
		Re: Kustom Bass III Channel 1 Hiss By: stevem on Wed, 10 August 2022 09:42
		Re: Kustom Bass III Channel 1 Hiss By: thespeakerport on Sun, 21 August 2022 09:11

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