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Old 25th March 2012, 12:09 AM   #1
lawdawg is offline lawdawg  United States
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Default Magnavox 8608-10

Brand new to the forums, hope this is the right place for my question. I have my parents 45-50yr old Magnavox console. It has the 8608-10 tube amp in it & the radio & turntable play - so I assume it's in working order. Been reading up a lot about caps drying out & tubes needing replacing. Too many posts and options. Can anyone point me to a good starting point for these amps....Thanks
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Old 25th March 2012, 01:05 AM   #2
lawdawg is offline lawdawg  United States
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Old 25th March 2012, 01:42 AM   #3
TheGimp is offline TheGimp  United States
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The best source of info is the yahoo magnavox group.

otherwise it is a matter of searching the web for a schematic as a starting point.
While it may play, the front left aluminum cylinder is the main filter cap. It should be replaced as a safety precaution.

First is adding a three prong safety cord with ground to the chassis.

From this side it looks like a stereo 6BQ5 single end amp. what are the tubes?

These are nice little amps.

Last edited by TheGimp; 25th March 2012 at 01:55 AM.
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Old 25th March 2012, 02:18 AM   #4
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I'm guessing a 12AX7 and 2X 6BQ5/EL84s. Looks like the B+ rectification is SS of some kind, on the underside. 5 WPC is about right. The multi-wire umbilical is probably carrying power to and/or from the tuner. Unfortunately, the phono cartridge rates to be piezoelectric and anything but good. The turntable is probably no better, sorry. Look for a place where the turntable is connected to the tuner. You could pop those RCA males out and plug a CDP in there.

IMO, the I/P RCA jacks need to be replaced with something of higher quality that's spaced for modern "fat" interconnect cables. Mouser part numbers 568-NF2D-B-9 and 568-NF2D-B-2 (1 each) will do that quite nicely.
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Old 25th March 2012, 04:13 AM   #5
TheGimp is offline TheGimp  United States
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Tube in the back next to the power transformer is probably a rectifier. So not SS but tube rectification.

Single stage 12AX7 is about right for a decent SE amp with 6BQ5 output. Realistically about 3W.

That said, 3-5 W is a nice SE amp for driving from a computer, MP3 player etc for office or desktop usage.

Power isn't everything.

My grand-daughter and wife are happy with 3.5W.

Those old Magnavox amps are nice starter systems.

What are the speakers I see in teh pix?
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Old 25th March 2012, 12:25 PM   #6
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Quote:
Tube in the back next to the power transformer is probably a rectifier. So not SS but tube rectification.
Gimpy,

Your eyes are better than mine. The photo is dim, towards the rear.

5 WPC is enough to produce ear splitting volume, in combination with high efficiency horn speakers.
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Old 25th March 2012, 01:59 PM   #7
lawdawg is offline lawdawg  United States
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Old 25th March 2012, 02:05 PM   #8
lawdawg is offline lawdawg  United States
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Thanks for the info guys....this is part of a console my parents had while I was growing up. They didn't want it - I did. The rectifier shows 6CA4, then two taller tubes show 6BQ5, then a smaller one in front of the filter cap shows 6EU7. The console is in good shape, but I have a vintage pair of Chorus II that would really like this amp I bet. @Eli - do I need to find it coming from the tuner because there is a pre-amp involved? Sorry - I'm not versed in the way these amps work.
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Old 25th March 2012, 02:06 PM   #9
lawdawg is offline lawdawg  United States
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This is as it sits....
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Old 25th March 2012, 03:48 PM   #10
TheGimp is offline TheGimp  United States
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If I had one looking that good, I'd keep it stock and enjoy it.

6EU7 is essentially a 6 volt 12AX7 with a different pin out. It was spec'd as a high grade low hum audio amp tube.

Is that a schematic in the lower left, or just a wiring diagram?

That may use the same schematic as the 83XX series for the amp.
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Last edited by TheGimp; 25th March 2012 at 03:59 PM.
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