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Old 3rd October 2008, 02:35 AM   #41
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Hi all,

Since I don't have a power switch to install at the moment I clipped the white wire
attached at the far left of the terminal strip. I then clipped the purple wire to the right of the
white. I connected the white to the purple which should have completed the power to the
Red/Black and the Black. I then attempted to preform a Dim Bulb test with the amp. I put a
25W bulb in the socket, plugged the amp in, flipped the switch and... argh bright bulb that
should be dim. So, it appears I have a short.

What do I do next?

Thanks,

Alan
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Old 3rd October 2008, 03:28 AM   #42
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I just checked and the Mullards are indeed Blackburn tubes!

As far as the chassis swap goes - I know I won't be able to switch OPTs on the current chassis, which is too small for it and has lots of unsightly holes from all the controls being removed. Additionally, I've never been too keen on the exposed open frame transformers - seeing as how they aren't pet or visitor friendly.
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Old 5th October 2008, 04:53 PM   #43
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If you haven't already, I recommend you check out this site for your vintage Magnavox needs. There you will find schematics, photos and a pretty good forum devoted to the old Maggies.

I'm building a walnut cabinet for mine today. I'll post some pics when I'm finished.
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Old 14th May 2013, 07:29 PM   #44
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Wow. It has been a long time since I did that, and just now am seeing this post. Been ill and too busy trying to survive. Sorry folks. But I want to say a big thanks for the kindly kudos. All I did was put in lots of TLC, attention to component values, and more TLC. I am glad you were, have been, still (?) enjoying it.

Gabe
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Old 16th May 2013, 10:20 PM   #45
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Gabe,

Sincere prayers that your health improves! After a series of personal and professional setbacks, I recently emerged from the fog and have my life back. I listened to that amp for countless hours and still love it. But sometimes we have to "let go" to find ourselves. So, I recently gifted that amp to a dear electrical engineer buddy from college. He's a great musician and I wanted him to appreciate it as well in his home studio. I'll never forget that amp and now he gets to make a few memories with it too.

Robert
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Old 28th July 2013, 12:19 AM   #46
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On my way to restoring one of these amps also, to add to my current magnavox collection: one 175-55, a 196ba, an 8601 and now a 9303. Can't wait to hear the 9303, i have a full set of mullards for it and i cant wait to finish it. Gabe i will be happily using your schematic for my restoration with the best possible components i can lay hands on, hopefully i can do it justice.
What really is hard to believe is how much bigger the output trafos on this amp are compared to the 195-55s trafos, and that amp is running 6v6 tubes and has bass for days, may this amp actually best it? :O
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Old 7th January 2014, 04:14 AM   #47
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Quote:
Originally Posted by nubskillz View Post
On my way to restoring one of these amps also, to add to my current magnavox collection: one 175-55, a 196ba, an 8601 and now a 9303. Can't wait to hear the 9303, i have a full set of mullards for it and i cant wait to finish it. Gabe i will be happily using your schematic for my restoration with the best possible components i can lay hands on, hopefully i can do it justice.
What really is hard to believe is how much bigger the output trafos on this amp are compared to the 195-55s trafos, and that amp is running 6v6 tubes and has bass for days, may this amp actually best it? :O
There have been some blind studies on output transformers and in general the performance can be rated in the size of the transformer. If you look up the details (if you can find them) you have the details then you'll find that inductance is the important part for bass performance and small transformers just do not have the space to hold enough wire to create that inductance at the required current.
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Old 7th January 2014, 06:16 PM   #48
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I have the big boy Magnavox, the Concert Grand. 32 total tubes. 4 power amps (16 6V6's) Each channel is bi-amped into a horn and 15" driver. The sound very powerful. The sound is nothing short of spectacular even by today’s standards. It’s too bad we lose to many of these each year because people gut them and sell off the parts.
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