#31
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As seen from the layout, the resistors are connected in parallel with a paper capacitor of a pretty good value (.047uF), so they don't seem like a plate load; rather a sort of B+ divider, damper or bleeder.
You ought to check the schematic diagram to make it clear.
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To understand a bygone era, you should use things from it Last edited by Gleb; 01-21-2019 at 12:05 PM. |
#32
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Quote:
BTW, what procedure do you use to remove all the old leads and solder from the terminal strips? On occasion, I use a desoldering iron like used on PC boards. As usual, amazing work! |
#33
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Guys, here is the schematic of those 3 resistors. R131,R132, R133. Looks like I could use a wire wound resistor there...right?
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#34
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I usually clip the component free leaving about 1/4 to 3/8 inch on the terminal strip. I then use solder wick to get as much solder off. Then I remove the old leads and again solder wick for final solder clean up. Then using a cut down acid brush, I brush with some acetone to clean off the old resin and make the terminal nice and clean. Then on to installing the new components.
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#35
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Yes you can use any type there; it's just a current limiter for the 2nd grid of the horizontal output tube (V23). It seems that three usual carbon resistors were simply cheaper than a single wirewound one.
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To understand a bygone era, you should use things from it |
Audiokarma |
#36
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I agree that a wire wound should be OK there. Seems odd the way they have the other side of C123 connected to the cathode instead of ground, as if there was some AC signal to be transferred from one to the other.
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#37
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I installed the wire wound.
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#38
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While I was on the same side as the Candohm, it was reworked with 3 25W chassis mounted resistors and I used some 2W resistors to "Trim" them to the correct values. All within 1.2 ohms or less than specified.
I then continued working my way through the chassis. I reworked the interlock, V23 and surrounding area. |
#39
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Another section completed. This section had some repair work done to it before I got to it.
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#40
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Reworked V18 the Sync Amp and Syns Sep. This pretty much completes the Vertical section. Tomorrow I'll move downward through the chassis to the Horiz. section.
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Audiokarma |
#41
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Moving down to V21. The Horiz. AFC section. Next up V22 the Horiz. Osc.
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#42
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Finished V22 tube the H. Osc.
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#43
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If you look at the lower terminal on the terminal strip in the picture above you'll should see that I replaced the single conductor shielded wire. I used some 20awg wire I had from when I wired aircraft avionics. Good stuff. The reason I replaced it was the center insulator was breaking down and crumbling away, thus creating a possible short between it and the shield. The same thing with the Phono input wire. This will get replaced also.
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#44
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I completed tube V9, V10, and V11. Video Amp, Video Output, and Noise Inverter.
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#45
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V13 and V14. 1st and 2nd Sound IF done.
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Audiokarma |
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