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What's the most probable cause of this vintage TT problem?
What's the most probable cause of this vintage TT problem?
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Old 23rd October 2017, 05:28 PM   #11
AmpUtator is offline AmpUtator  United States
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Great find DangerBoy. I love the retro look.
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Old 26th October 2017, 01:50 AM   #12
DangerBoy is offline DangerBoy  Canada
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Default Let's begin the restoration

Okay, let's start planning what we're going to do.

I don't think it'll cost that much to try Option 2 first and that option has the advantage of keeping all of the adjustment knobs fully functional. If the thing still sounds like crap or can't power the replacement coax drivers, I'll switch to Option 3 and re-amp.

First lets look at all the insides of the thing in a macro view:

Click the image to open in full size.

If we look along the right side where the various tone and volume controls are. It can be seen that there's quite a lot of brown blob non-polar coupling caps there. There's also some transistors and lots of resistors. Any reason I should target the coupling caps and replace them as a matter of course or should I just leave them alone? Below is a close-up of some of the coupling caps.

Click the image to open in full size.

What about the transistors? Below is a diagram showing what transistors are being used. I believe there are modern day replacements available for them.

Click the image to open in full size.

Below are two views of the PSU and amplifier section in two different machines. A number of electrolytic caps can be seen there.

Click the image to open in full size.

Click the image to open in full size.

I've outlined the caps I'm thinking I should definitely target for replacement. Is there anything else in this section I should also target?

The fuse is blown on the unit I have so rather than replace it with one of those soldered in glass fuses that are a hassle to change out, I'm wiring in an inline glass fuse holder. I can tape the spare fuses inside the chassis so they're immediately handy if the fuse ever gets blown again. The PO blew the fuse when he was tinkering. Hopefully, the fuse did its job and nothing was damaged.
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Old 26th October 2017, 01:56 AM   #13
planet10 is offline planet10  Canada
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What's the most probable cause of this vintage TT problem?
Is there a power transformer anywhere? This is of a vintage were output transformers are used, and they look to be of a decent size for the kind of device.

dave
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Old 26th October 2017, 02:30 AM   #14
DangerBoy is offline DangerBoy  Canada
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Quote:
Originally Posted by planet10 View Post
Is there a power transformer anywhere? This is of a vintage were output transformers are used, and they look to be of a decent size for the kind of device.
I thought that's what those things wrapped in tape or paper inside the metal housings in the upper and lower right hand corners of the amp/PSU section were. Is that not what they are?
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Old 26th October 2017, 02:42 AM   #15
planet10 is offline planet10  Canada
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What's the most probable cause of this vintage TT problem?
I’m pretty sure those are output transformers… look to see if one set of leads connects to the transistor sockets and the other to the loudspeaker jacks. With no power transformer, that is something you’ll have to sort so that it isn’t a safety hazard.

dave
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Old 26th October 2017, 03:59 AM   #16
scaramoucheii is offline scaramoucheii  United States
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Quote:
Originally Posted by DangerBoy View Post
Click the image to open in full size.

Looks like the Power Transformer is on the "top" of the chassis. Isn't that it the the bottom left corner of the photo? You can see the laminated plates and the 4 x fasteners securing it to the chassis
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Old 26th October 2017, 04:02 AM   #17
planet10 is offline planet10  Canada
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What's the most probable cause of this vintage TT problem?
It does look at it, but there would have to be room for the TT to clear it.

dave
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Old 26th October 2017, 04:03 AM   #18
ogromnii is offline ogromnii  Bulgaria
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Power transformer is visible in the left bottom corner trough the square window. Some types germanium transistors tend to pass away with years, get noisy or stop working at all, real pain in the *** as there are no direct silicium equivalents, you have to rebias circuit. Good luck nice project.
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