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Post by Ron Rich on May 15, 2018 23:45:13 GMT
Hi Mauro, Lotza luck on your shoulder--you can take my left one with you, --- maybe the doc will make a two for one deal  Let us know when you can ! Ron Rich |
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Post by robnyc on May 16, 2018 1:47:55 GMT
Mauro, I scanned in a diagram from my 1955 RCA tube book. www.flickr.com/photos/90641375@N06/28267085198/This was what I used back when modding amp with octal inputs -but I didn't keep any notes and just "winged it". There probably a lot of other circuits that can be used here -as long as you remove the eq. and add a pot to trim the gain. RobNYC |
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Post by mauro on May 16, 2018 3:38:58 GMT
Ron and Rob,
Thanks for the info and well wishes!
I'll let you know how it goes,
Mauro
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Post by mauro on May 17, 2018 1:31:38 GMT
Hey hey, I'm back.
Surgery went great, I'm home and should be back on this amp and building a preamp in no time.
Stay tuned, more questions to come!
Mauro
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benp
New Member
Loving life in Central Pennsylvania
Posts: 10
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Post by benp on May 25, 2018 21:56:43 GMT
Hi Mauro,
The bass on these Seeburg amps is turned down as the volume control is turned up. I think the bass is fine but the resistor on the input that bleeds signal off to ground should be clipped out. Mine only has a cap at the input but the schematic shows a resistor.
You can boost the output sound by jumping out the 330 resistor on pin 3 of the 6SN7. This will compensate for the 70's cartridge.
Ben
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Post by mauro on May 25, 2018 22:13:42 GMT
Hi Ben,
I've done the piggybacked resistor and increased the input resistor to 470K.
I'm good with the sound now but need to get rid of the squealing.
I started another topic thread to deal with this.
Thanks,
Mauro
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