Need schematic for JMI AC30/6 Top Boost

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Need schematic for JMI AC30/6 Top Boost

Postby Hollowbody on Sat Jan 27, 2007 12:30 am

Anyone know where I can find a schematic for a mid-60's JMI AC30/6 Top Boost amp? I'd prefer not to have to pay for it. I've seen the 1960 non-top boost AC30 and the top boost modification schematics, but I'm assuming there's another.

Thanks,
Adam
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need schematic for ac30/topboost

Postby schematic on Sat Jan 27, 2007 1:48 am

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need schematic for ac30/topboost

Postby Hollowbody on Sat Jan 27, 2007 4:35 am

I tried schematicheaven.com, and found these:
AC-30 Poweramp
AC30 standard non top boost model - 1960
AC30 top boost mod - 1961
AC30 topboost preamp

Do I refer to any or all of these, or is there a separate, standalone schematic for a topboost model (1960s)?
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Postby Stephen on Sat Jan 27, 2007 9:54 am

Hi,

I don't believe that Vox (JMI) ever produced a schematic for the intergrated top boost AC30.
You could use the Dallas Music Industries schematic (Vox AC30 Treble and Bass), which uses the same circuit for the top boost as the JMI amps, apart from the fact that the Dallas schematic does not show the 25uf cathode bypass capacitor on the first triode of the top boost valve, which is there on the JMI schematic.

Stephen

www.thevoxac30guide.com
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Postby rogera on Sat Jan 27, 2007 4:34 pm

Adam, I've put a link here to a circuit of an AC30 that includes the top-boost channel.

It's not an official Vox diagram - I found it many years back in an electronics mag that I used to get.

Maybe others will find it useful also.

http://www.vintage-sounds.co.uk/pics/ac30-topboost.jpg
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Re:

Postby roseblood11 on Wed Sep 06, 2017 9:11 pm

rogera wrote:Adam, I've put a link here to a circuit of an AC30 that includes the top-boost channel.

It's not an official Vox diagram - I found it many years back in an electronics mag that I used to get.

Maybe others will find it useful also.

http://www.vintage-sounds.co.uk/pics/ac30-topboost.jpg


Where does this drawing come from and from which year? German "Elektor" magazine?

And which version of the AC30 is this? Maybe the Dallas Industries "Trebe and Bass" model from the mid 70s?


PS: I know that the thread is 10 years old...
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Re: Need schematic for JMI AC30/6 Top Boost

Postby bazmusicman on Fri Sep 08, 2017 9:52 pm

Do yourself a favour and buy Stephens book...the Vox AC30 Guide. At only £9.99 It's worth every penny.
Regards,
Baz.
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Re: Need schematic for JMI AC30/6 Top Boost

Postby vintagekiki on Fri Sep 08, 2017 9:59 pm

Need schematic for JMI AC30/6 Top Boost


http://music-electronics-forum.com/t40538/
Voicing Vox AC-30
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Re: Need schematic for JMI AC30/6 Top Boost

Postby Kagliostro on Thu Oct 05, 2017 10:31 pm

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