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Vintage threads from the first ten years

Re: '51 Deluxe (5A3?) restoration advice

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6/6/2000 1:40 AM

Re: '51 Deluxe (5A3?) restoration advice

quote:
"I had read here that a 5751 is very similar to the 6SL7... but if they are that similar why would Mr. Allesandro use a 6SL7 in his Hounddog Redbone? Just wondering..."

The amplification factors for both are similiar, 70u off of a GE data sheet on the 6SL7. And 78 for the 5751 out of the Audio Designer's Tube Register. I keep hearing that the 6SL7-or octal preamps in general are fuller and sweeter sounding than the 9 pins. Guessing Allesandro was going for all the mojo....

just regurgatating what I've heard

bw

6/6/2000 4:11 AM

quote:
"http://www.ampage.org/blueguitar/5b3_sch.jpg

http://www.ampage.org/blueguitar/5b3_sch.jpg"

/>Steve, what's the difference of these two files?
Bruce

6/6/2000 4:28 AM

RE: the schematics. Da nada. BTW, you uploaded the 5B3 schematic twice (instead of the layout and the schematic).

RE: jumpering the socket. Yup, this looks like Lupe Lopez wired her up to use either tube. I like the way the amp sounds, so I'm inclined to keep the 6SL7 in there (but will try a 6SC7 for snicks as well). The 5751 has about the same gain, but smaller plates. I don't recall the transconductance right off hand but the big octal preamp tubes sound warmer to me than nine pins.

Hasta -> Rico

6/6/2000 10:54 AM
Graywater	Dr R, To give you more options, the 6SU7 is a "selected 6SL7 with Micanol base, low gas and leakage tested for balance ... 6SU7 matching specifications are passed by only about half of productions 6SL7s" Tube variants: 6SC7 - 1655 6SL7 - 6113 6SU7 - 6188 Information from "Tube Lore" by Ludwell Sibley. GW

6/5/2000 2:47 AM
Steve Ahola	Rico: P.S. Do you want the 5B3 schematic and the schematic I made of my circuit? Definitely! If you have a scanner maybe you can e-mail them to me. --Thanks! Steve Ahola P.S. As for the mystery cap, my guess is that it is 100pF/1000v. Good luck!

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