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Jukebox Tube Amp

204.152.152.56
Posted on May 27, 2015 at 07:05:10
ESDI-80
Audiophile

Posts: 620
Location: East Coast
Joined: January 1, 2008
 Guys,

I picked up a jukebox tube amp for $25 at an arcade auction two weekends ago. It's stereo with 7868 output tubes in push pull. I believe the brand of the amp is Rock-Ola.

How well do these amps do in a normal stereo audio set up? I was thinking of restoring it and mating it with my Dynaco A25s.

Mike

 

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RE: Jukebox Tube Amp, posted on May 27, 2015 at 07:21:47
Tom Bavis
Audiophile

Posts: 961
Location: Upstate NY
Joined: May 25, 2007
 Some of the Jukebox amps had surprisingly good output transformers. I measured one with OEM P/N 39234-SEI-33061, was made by Stancor (code 138), was flat to about 40 KHz. If that's the one you have let me know, I'll send the data. I don't have a schematic for that amp handy, but I believe I found it on-line.

 

RE: Jukebox Tube Amp......, posted on May 27, 2015 at 09:09:06
drummerwill
Audiophile

Posts: 965
Location: St Louis Mo.
Joined: January 7, 2003






.....here's my restored Wurlitzer Jukebox amps.. I love these things...


Willie

 

RE: Jukebox Tube Amp, posted on May 27, 2015 at 09:13:26
6bq5
Audiophile

Posts: 4390
Location: SF Bay
Joined: August 16, 2001
 I would look at the wiring closely - it may well have the RIAA EQ and pre-amp stage integrated -
They were built for Phono Only...
Happy Listening

 

RE: Jukebox Tube Amp, posted on May 29, 2015 at 05:51:17
huubdas
Audiophile

Posts: 138
Joined: August 30, 2009
 Find out the circuit and see if the amp works in Class B or AB. (Class A I've never seen) Calculate global NFB, most use 10 dB, that's good with Class AB. I've never seen Ultra Linear, alway's Penthode Push Pull.
Class B oke but not for High End.

 

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