Tonearm Rewire

speakerman1

Honorary Forum "Larrt" (ornery too)
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#1
I got the Cardis stuff yesterday. I'm glad I have a solder station with clips and a magnifying glass. This is going to be fun. With me shaking and almost blind, Has any one done this? Any hints. I want to hear if it makes a difference. So I will probably do it Monday and put it into rotation before I ship it. If it does I will do all my TTs.

Larry
 

tapepath

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Jun 22, 2011
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#2
Hello Larry,
One approach to consider is to use a wood toothpick to support the cartridge clip while you solder the wires. If you have one of those alligator clip type holders use it to hold the toothpick with the clip on its end. There are some of those holders that have two alligators, one can hold the toothpick and the other can be bent around to support the wire. That way all you have to do is concentrate on the soldering part.
I hope this is helpful.
 

speakerman1

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#5
When I first got the wires I was going to send a nasty email. I thought there was only 2 wires. They are so small there was 4. LOL

Larry
 

laatsch55

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#6
Now THATS funny.

Tapepath, that is a beautiful deck in your avatar, it just oozes nice and smooth.
 

laatsch55

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#7
Beautiful website Ken, and very nice work on those classics, glad you're here.
 

tapepath

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#8
I'm glad the information was helpful. There is a mail order company called MicroMart and they have all kinds of tools for craftsmen. One is a combination dual alligator holder and magnifying glass. The deck is a fairly early version of the Revox PR99, which is the final incarnation of the A77. It was intended to be a professional deck, balanced outputs, 1/2 track, high speed record/play. I went over it pretty thoroughly and had the back metal cabinet powder coated a nice blue. It's a good one to look for since early versions still have discrete output transistors, before everyone went to integrated circuits.
 

speakerman1

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#9
There is a place in China. I think I ordered from. Got digital scales all kinds of stuff for 40.00. Got here fast. I ordered little round batteries by the hundreds. Solder wick. I have about 20 roles of it in my drawer. Stuff is cheap. I'll have to find that link.

Larry
 

laatsch55

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#13
WilliSSSSSSSSSSS!!!! See, told ya , I need to go, you are just wayyyyyyyy to fertile ground for me to behave myself today. Happy loading, The woman is ready and the oilfield awaits.
 

laatsch55

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#15
That's just it, I don't and I still responded like you didn't!??

orangespeak 101
 

laatsch55

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#17
Ken, one question. I see when you swap out old caps you sometimes stack polypros(?) and extend the leads quite a bit. I have done that on a lot of amps where an axial is no longer avaiable or when an audio grade is called for, do you experience any noise induction you can trace to that or is that such a low level environment it's not a concern??
 

tapepath

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#18
Hello,
There has only been one problem, so far. I was working on an A77 and there was a buzzing sound coming from the input amplifier board, which is the one closest to the AC on/off assembly. It drove me nuts for several days. If I touched the cap it would buzz, if I put in an unmodified board, no problem. If I removed the cap and held it away from the board with leads attached, no noise. I finally traced it to a bad transistor. The circuit worked, but for some reason the combination of a single metal film cap and the bad transistor resulted in noise. There is a metal shield used by Revox to shield the AC path from most of the circuit boards, and I put an additional piece of shielding (per Jack Clark's recommendation) to extend the coverage further. I also replace the input/output cables with Cardas shielded coaxial. Revox sends the output cables over the top of the take up motor, seemed a bit risky to me.
Because of the relative positions of the power supply, AC assembly and the circuit boards having two 10uF caps on top of each other doesn't seem to be a problem. Especially if you consider that the original caps are all tantalum composition. I also like the result of using a .1uF in parallel with any cap I use.
I hope this is helpful.
 
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