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Forums :: Ask Amp Tech Expert Skip Simmons

Fanon-Masco FMA-20

2 replies [Last post]
Mon, 04/01/2013 - 09:51
marcos
marcos's picture
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Teacher 9Level 10
Joined: 01/11/2010

Hi, Skip.

I recently acquired a Fanon-Masco FMA-20 PA head. It looks like it would have potential for harp.
Assuming it isn't totally trashed, would it be worth modifying for harp use? Does it have any outstanding characteristics/flaws/attributes that might help me decide whether to pursue it (as in, to send it to you?).

A couple of 12AX7s and a 7189A (and a C6A4 rectifier).

I figured that if anyone has had experience with these, it must be you!

Thanks.

Mark H.

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Wed, 04/03/2013 - 08:55
#1
Expert Skip Simmons
Expert Skip Simmons's picture
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Joined: 01/18/2010
Fanon-Masco FMA-20

Hello Mark- Thanks for writing. That amp certainly has potential, but it would require some serious modifying for harp use. In general, I'm not a big fan of 7189s (actually heavy-duty EL-84s) for harp. As the prices for older Masco amps go up, I bet we see more people hoping to fix up the later Fanon-Masco amps like yours, but I think you would be better off with an amp with 6L6s or 6V6s. Also consider that anytime you see a 20-watt amp with EL-84s, those tubes must be running very hard and at very high voltages. You would be replacing power tubes more often than I'd like! Price those 7189s......$$$$!

Skip Simmons

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Thu, 04/11/2013 - 16:53
#2
marcos
marcos's picture
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Teacher 9Level 10
Joined: 01/11/2010
Thanks, Skip

Maybe I'll save my money and effort for a different project....I've got a couple of tube tape recorders...........

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