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Does anyone know this english amp ?
Does anyone know this english amp ?
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Old 4th August 2004, 11:10 PM   #11
Eli Duttman is offline Eli Duttman  United States
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
A power trafo designed for 50 Hz. service will work just fine with 60 Hz. "juice". The other way around can produce overheating.

That 50 Hz. marking is GOOD for someone living outside North America.

Examine the power trafo carefully. Perhaps it has dual primaries that can be wired for "230" V. mains. If the trafo has a single "115" V. primary, a step down autotransformer can be used with confidence.

BTW, poor deep bass performance on the part of the O/P trafo is not a problem in guitar service.

The 6V6 is an EXCELLENT O/P type, in both guitar and HIFI service. Hopefully, the Mullards currently installed will last a while. Current production ElectroHarmonix (Russia) 6V6s have been engineered to be tough. EH 6V6s should be adequate, if unspectacular, replacements when the Mullards wear out.
Eli D.
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Old 4th August 2004, 11:23 PM   #12
fdegrove is offline fdegrove  Europe
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Join Date: Aug 2002
Location: Belgium

Examine the power trafo carefully. Perhaps it has dual primaries that can be wired for "230" V. mains.
With all due respect but I really doubt it would.

Belgium, just like the U.K. used to have 110VAC mains in those days. Which is probably one reason why the amp(s) got imported from across the Channel, I suppose.

A stepdown xformer + a variac seems to be the safest way to crank the old thing up as EC8010 correctly suggested.

It's really impressive to see all this "local" knowledge appearing on the forum
I had the exact same feeling...can't help but wonder how many other sleeping beauties will be "uncovered"....

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Old 4th August 2004, 11:49 PM   #13
v-man is offline v-man  United Kingdom
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Join Date: Jul 2004
Location: wales
The one i used for the conversion was also a 110v transformer,and did not have any other taps for alternative voltages. i changed it for a 240v type.
i agree, the 6v6 is a great little tube,and more eficient with only half the heater current needed of its replacement the EL84. dont worry too much at the moment, there are still some mullards to be had.
but like all original old stock valves/tubes they are getting harder to source, and more expensive as the years go by.
by the way, the output transformer on this little amp worked amazing with the fender [5c3] circuit.
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