.50 Caliber '87 (EL84) - I Need help!

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Hello - just a thought: check mains transformer has all secondary connections made; sounds crazy but I worked on a studio 22 & all dc voltages across the board were low...!
Took me a while but traced problem back to mains tx which had one of the red, sec leads blanked off (on cct diagram it's R1 or R2 - both of the red leads feeding the rectifier diodes D2-D5; only one set of diodes was effectively connected...!!)....amp worked fine but was even better/louder obviously after connecting all sec tx leads - plus, all dc voltages now very close to schematic values.
May not be the fault that you're experiencing but worth a look eh...?!
Cheers, Paul
P.S.: the transformer for USA can be converted to UK voltage by connecting the primaries in series instead of parallel (connect mains neon across half primary to protect it from over-volts)... :)
 

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