Magnatone Varistors  [found]

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Magnatone Varistors

Postby KindaFuzzy » 19 Jan 2010, 13:07

I know these are super rare, but you never know so I thought I'd ask. After seeing Phil x do all those demos on youtube with his 213 or 250 tonemaster amp, I thought It would be cool to build one of those amps. The only info on the varistors in the vibrato circuit I could find was some part numbers, FR1039 and FS308 which were 1MA @ 68v and 1MA @ 110v silicon carbide varistors.

Does anyone have a few of these or know of a work-alike and where to get them? Thanks.
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Re: Magnatone Varistors

Postby frequencycentral » 19 Jan 2010, 14:46

Can't help with a source for origianls, but I rememeber RG posting somewhere that modern varistors differ so greatly to the old ones that it makes them unusable in a Magnatone vibrato circuit. :(
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Re: Magnatone Varistors

Postby KindaFuzzy » 19 Jan 2010, 14:54

Yeah, I found that post too, boo-urns for sure.
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Re: Magnatone Varistors

Postby KindaFuzzy » 30 Jan 2010, 22:16

I can't believe I found some of these guys! Does anyone know what the markings stand for, I'd hate to kill one with too much voltage or something.

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Re: Magnatone Varistors

Postby gmr1 » 01 Feb 2010, 17:28

Huh. IIRC, I think I have a box of those in the basement that I got as part of a huge parts lot from an old radio repair guy a few years back. Figured they were just antiquated resistors or something along those lines. I'll have to dig them out and see what I got.
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Re: Magnatone Varistors

Postby KindaFuzzy » 01 Feb 2010, 19:31

Yes, and then we'll have a chat. :D
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Re: Magnatone Varistors

Postby Whoismarykelly » 12 Feb 2010, 03:57

I have a Magnatone TC1 chassis with the vibrato circuit if you want a full set of varistors and some other original parts like transformers, etc...
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Re: Magnatone Varistors

Postby odgeuk » 13 Apr 2010, 21:36

I'm after a pair of these for a Magnatone clone. Can anyone help :D

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Re: Magnatone Varistors  [found]

Postby tacromx » 16 Aug 2015, 17:05

This thread is quite old now, but i found this pdf which might be of use, in it is a workaround using 3 MOV's and three resistors in order to closely match the V-I curve of one Magnatone varistor.

Also there's this if you have the money.... http://www.ebay.co.uk/itm/Matched-Pair- ... 28059f5d49 seems a bit extortionate though.

PDF @ http://dalmura.com.au/projects/Magnaton ... design.pdf

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