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#1
06-15-2025, 03:01 PM
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Come on, Dover! Move your bloomin' arse! 
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために 
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#2
06-16-2025, 07:14 AM
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#3
06-17-2025, 09:59 AM
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The stupid focus potentiometer fried again, and smoked the new 560 ohm resistor that was feeding it, both being rated at 500v 5w, this happened as soon as it was mounted back to the chassis and it's ground, it had been working fine all this time out in the open, not sure why it did this, the 560 ohm resistor is hooked to the main filter choke through the H & V centering pots, (30 ohms), seems that the entire LV bias is fed through the centering pots, sort of like the early RCA sets, then the focus coil (409 ohms) / focus potentiometer & resistor then to the voltage divider network.
The only difference I see from this set and early RCAs is that RCA had the focus circuit in series with the -100v line, and this has it in series with the +250v line, other than that, they seem the same. Since I can't get an original OEM pot, I guess I will have to keep the focus pot isolated from the chassis, and mount is elsewhere, not sure why it burned through the dielectric of the pot again, it's not like it is being hit by huge voltages or something. :/
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#4
06-17-2025, 08:11 PM
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old CRT wiring...
http://suzaku.live-evil.org/0616251826.jpg vs the new. http://suzaku.live-evil.org/0617251947.jpg took me a bit longer to finish as the nylon wrap was delayed, 
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#6
06-20-2025, 11:46 AM
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Ran for over an hour last night, no smoke or fire, FBT gets a bit warm, but no dripping wax , so far.
Running OK with one output tube, the h-sync system on this seems to be VERY picky, wanting to lose lock when shut off and on, this seems to have been very common as it looks like the “ horizontal speed” slug had been turned very VERY often before I even go it, not sure how to get this more stable, though it SEEMS to be rather locked now, only time will tell. Not sure what else to hit with this silly set, all the paper bombs are replaced, resistors are in spec, only thing left are the mica caps in the area, but, they rarely go bad, right? I don't want to mess with them if i don't have to.
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#7
06-20-2025, 02:50 PM
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Sweep micas do fail (in electrostatic deflection sets they're almost a must replace proposition) and they aren't critical to alignment so they're worth replacing if you can't test them to their ratings and everything else has been verified.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#8
06-21-2025, 01:43 PM
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Well it seems stable at the moment.
But it has 5 of the old domino type mica caps in the area. http://suzaku.live-evil.org/magie-mica.jpg 2 of which I ordered, but not put in yet. mouser- 598-CD15CD050DO3F 598-CD19FD331FO3 To replace or not to replace, thus is the question!
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#9
06-21-2025, 06:16 PM
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#10
06-23-2025, 09:45 AM
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ordered and about to ship.
Mouser parts. 5982-15-500V180 598-CD17FD101JO3F 598-CD19FD182JO3F to go with the ones i have. 598-CD15CD050DO3F 598-CD19FD331FO3  These Mica caps sure are $$$ compared to film types. :O
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#11
06-24-2025, 08:06 AM
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In oscillator places is good to maintain same dieletric due to tempco, or oscillator will drift distinctly than the original one.
EDIT: that said, some are non-critical ones and not suffer from change.
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So many projects, so little time... Last edited by Alex KL-1; 06-24-2025 at 08:13 AM.
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#12
06-24-2025, 08:32 AM
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Quote:
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#13
06-24-2025, 08:44 AM
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Quote:
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#14
06-24-2025, 09:56 PM
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I assume this is the 180pf cap?
http://suzaku.live-evil.org/0624252143.jpg I never could work out how to decode these dots on these things! 
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#15
06-25-2025, 07:25 AM
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Looks like 82pF
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