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Art-13 questions in a 8xx modulated by 811's




 
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Author Topic: Art-13 questions in a 8xx modulated by 811's  (Read 1421 times)
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w9jsw
Two shots of Whisky
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« Reply #75 on: April 08, 2018, 06:33:52 AM »

Shane,

Dahl lists replacements for both amps and give specs. The Dentron direct replacement is S1) 0-640-1010 VAC @ 600 MA CCS. The direct replacement for the Drake is S1) 1065/780 VAC @ 0.81A CCS.

I am guessing this will "work" but be even more anemic than the reported drake PS.

The Heath SB-220 is a closer fit - S1) 860/1171 VAC @ 0.7A CCS, but they sell for around $175 one the 'bay. $100 more for 100ma. hmmm...

There are a lot of other options listed for the Drake. One that is very interesting is this -

DRAKE L4B-X2B-SC
FOR USE WITH BRIDGE REC & SWINGING CHOKE
CORE) A-0518/ C-CORE         STYLE #) 10  HIPERSIL C-CORE

PR) 120/240 & 48/96 VAC 60 HZ 1 PH

S1) 3200 VAC @ 1.2A CCS

The guy I bought the amp from suggested this sort of mod. He said that the 3-500 tubes can certainly handle it and the rest of the amp is built to take it as well.

Interesting...

John
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