Bass guitar amp using 832a/GU32 tubes - diyAudio
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Old 30th October 2011, 10:58 PM   #1
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Join Date: Oct 2011
Location: Brisbane Australia
Default Bass guitar amp using 832a/GU32 tubes

Hi All
I am relativly new to tubes and I am currently building aKT88 PPP amp with cascode input (Ian Millers DUD-120) and I am also looking to buils my son a Bass practice amp using a GU32 tube ( because it is a very cool looking tube).
I was wondering if anyone out there has any experiance using these tubes for a bass amp.
A proven schematic would be fantastic.

I have done a search and have found several schematics with an output around 5W but I dont know if thay are acceptable for a guitar amp.

[IMG]file:///C:/DOCUME%7E1/DAVIDJ%7E1/LOCALS%7E1/Temp/moz-screenshot.png[/IMG]GU32 What Watt PS 23NOV09.jpg

GU32 WhatWatt.jpg

Your help will be greatly appreciated.

Cheers
Dave
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Old 1st November 2011, 01:13 AM   #2
jjman is offline jjman  United States
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Join Date: Jan 2009
I would replace the input control with a 1 meg resistor to ground. Then replace the 100k resistor in the middle with a pot for volume control. Unless the bass has a battery (preamp) in it, it may not like having 100k on it's output.

I can't really comment on whether the rest of the circuit might work well with a guitar or bass.
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Old 1st November 2011, 07:35 AM   #3
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Location: Brisbane Australia
Quote:
Originally Posted by jjman View Post
I would replace the input control with a 1 meg resistor to ground. Then replace the 100k resistor in the middle with a pot for volume control. Unless the bass has a battery (preamp) in it, it may not like having 100k on it's output.

I can't really comment on whether the rest of the circuit might work well with a guitar or bass.

Thanks for the input JJman.
I will make those changes and see what happens.
My son is currently using a 5W ss amp as a practice amp so this will hopefully be an improvement.
Cheers
Dave
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