Does anyone recognise this valve amp

katanassn · 15th January 2006, 08:02 PM

I think this is a stereo valve amp but am not sure what it.

Does anyone here have any ideas

DigitalJunkie · 15th January 2006, 08:15 PM

Hum,It definatly looks like a stereo PP setup.

The trannies almost look like they are the same ones in a Dynaco ST-70.

Looks like it was an Organ-amp,or part of a console?

7591 output tubes? (hard to tell in the pic)

rdf · 15th January 2006, 09:30 PM

It's an AMI/Rowe jukebox amp. Have one very similar under the bench, sourced from E-bay for the iron.

katanassn · 15th January 2006, 11:03 PM

Now the whole host of other questions. But I thing a quick google first.

Thank you.

katanassn · 16th January 2006, 12:58 PM

Ahh so parts aren't a problem but could it be used as home hi fi amp?

rdf · 16th January 2006, 07:51 PM

No idea at this point. Two medium-power OPTs and a power tranny for $50 was too good to pass up. I recall stumbling across a few internet posts praising the iron quality. I also like the true balanced out - it appears the output taps are symetrical to a centre ground tap - and the 70 volt windings. The two suggest some interesting options for feedback topology which I haven't really investigated yet. The only possible negative heard so far, and I'm not 100% it related to these specific models, was that some manufacturers tended to run jukebox power tubes at very low current to extend service life. It does suggest caution regarding output biasing is warranted when working without a service manual.

Honestly I really haven't done more than check out the wiring so far. Too many other projects on the go.

katanassn · 18th January 2006, 10:46 AM

Well I haven't got that far.

Looked at it and thought ahh bit of interesting soldering so was thinking of checking it over and may be getting a rebuild kit of valves and resitors. Then giving it a go.

katanassn · 23rd January 2006, 10:50 AM

Well it's a bit useless as I don't have the pre amp.

Oh well. Anyone gaot a preamp for one of these?

EC8010 · 23rd January 2006, 11:27 AM

Quote:

Originally posted by katanassn
Well it's a bit useless as I don't have the pre amp.

?

The only source that requires a preamplifier is vinyl. Everything else will drive your amplifier directly. Just add a volume control, and if you're feeling fancy, a selector switch.

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15th January 2006, 08:15 PM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Hum,It definatly looks like a stereo PP setup. The trannies almost look like they are the same ones in a Dynaco ST-70. Looks like it was an Organ-amp,or part of a console? 7591 output tubes? (hard to tell in the pic)

15th January 2006, 09:30 PM	#3
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	It's an AMI/Rowe jukebox amp. Have one very similar under the bench, sourced from E-bay for the iron.

15th January 2006, 11:03 PM	#4
katanassn diyAudio Member Join Date: Sep 2005	Now the whole host of other questions. But I thing a quick google first. Thank you.

16th January 2006, 12:58 PM	#5
katanassn diyAudio Member Join Date: Sep 2005	Ahh so parts aren't a problem but could it be used as home hi fi amp?

16th January 2006, 07:51 PM	#6
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	No idea at this point. Two medium-power OPTs and a power tranny for $50 was too good to pass up. I recall stumbling across a few internet posts praising the iron quality. I also like the true balanced out - it appears the output taps are symetrical to a centre ground tap - and the 70 volt windings. The two suggest some interesting options for feedback topology which I haven't really investigated yet. The only possible negative heard so far, and I'm not 100% it related to these specific models, was that some manufacturers tended to run jukebox power tubes at very low current to extend service life. It does suggest caution regarding output biasing is warranted when working without a service manual. Honestly I really haven't done more than check out the wiring so far. Too many other projects on the go.

18th January 2006, 10:46 AM	#7
katanassn diyAudio Member Join Date: Sep 2005	Well I haven't got that far. Looked at it and thought ahh bit of interesting soldering so was thinking of checking it over and may be getting a rebuild kit of valves and resitors. Then giving it a go.

23rd January 2006, 10:50 AM	#8
katanassn diyAudio Member Join Date: Sep 2005	Well it's a bit useless as I don't have the pre amp. Oh well. Anyone gaot a preamp for one of these?

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