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#1
08-22-2022, 10:35 AM
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On the choke red wire measures .29 amp yellow wire nothing. Not sure what that comes out to in ma.and the thermistor in place warmed up the ac lost 2 volts ended up at 113 vac so not bad I have an ac running here on the same line so it will be alittle low. I think I’ll run 3 wires out for the 3 voltages 145 190 275 to check with the chassis in all hooked up and take it from there but I do know the b+ was always low hooked up or out on the bench.
Last edited by timmy; 08-22-2022 at 10:54 AM. 
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#2
08-22-2022, 10:52 AM
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.29a = 290mA
very odd, could the DVM have been set for AC amps rather than DC?
__________________
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#4
08-22-2022, 11:06 AM
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it needs to be on the DC scale in order to take the correct measurement shown on the SAMS, if set to AC, it can be triggered by the AC ripple and give an inaccurate reading, thus you got .29a on one side of the coil and nothing on the other when set to ac.
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#5
08-22-2022, 11:11 AM
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My dvm does it digitally no way to set it to dc. Maybe the diodes are leaky at this point I don’t know.I checked my dvm I can switch it , it’s got ac on top dc on bottom micro amps if I switch it it goes to ac micro amps so I had it set right.
Last edited by timmy; 08-22-2022 at 11:22 AM.
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#6
08-22-2022, 11:23 AM
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Quote:
I have one of these as one of my 3 " throw away" DVMs https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1 If i fry it, no big loss, and I CAN set it to DC amps.
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#8
08-22-2022, 12:57 PM
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SI diodes don't normally wear out, this does not mean they can't be damaged or stressed, but if used within specs, they tend to last forever, unlike selenium.
I just find VERY unusual that you can't set your DVM from AC/DC amp measurement modes, if this indeed true, it casts doubt on everything it's telling you, and I do wonder what the heck type that is, cause in all my many years of tech repair, I have never seen that before. And, it's highly recommended that you get another DVM, like the one I suggested, or any other low to mid range one, and use it as a 2nd opinion. Don't rely on just the one, especially if it WON'T let you put it into DC amp mode.
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#9
08-22-2022, 01:10 PM
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Well this dvm never failed me it’s a g2 phoenix it just didn’t pick up dc I don’t know why. it has 2 scales top and bottom ac top dc bottom and when I powered up with the clamp on it initially gave me a quick number on the dc scale but went right to ac. I’m going to put the chassis back in and check the 3 voltages. I have 3 wires coming out to check these voltages.
Last edited by timmy; 08-22-2022 at 01:17 PM.
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#10
08-22-2022, 01:32 PM
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That explains it...
The inductive clamp sensor can only mesure AC current. To test DC, you must put the meter in series with the filter. http://www.instrumart.com/assets/uei...nix-manual.pdf WARNING your DVM can only take 2a max. https://www.youtube.com/watch?v=x2NLYydxbo4 You must put the DVM in line between the output of the diodes and the filter. The clamp on thing won't work.
__________________
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#12
08-22-2022, 02:52 PM
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Ok chassis back in hooked up b+ 350 v the 145 v is now 133 v the 190 v 165 v the 275 v is 244v these voltages are more in line now but drastically low and this was at 114 vac. I guess I’m going to pull tubes one by one maybe there’s one that was manufactured wrong even though the heater works all tubes do light up heaters are good. Well I hope it do come to a shorted ceramic disc finding that can be challenging unless a short goes away when a tube in that area is pulled.
Last edited by timmy; 08-22-2022 at 04:10 PM.
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#13
08-22-2022, 04:08 PM
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Keep in mind, the SAMS had the voltages taken with an input of 117, if you ar running at 114, you will of course see lower voltages, HOW MUCH lower, who knows.
to be 100% sure, you should be on a variac and at 117v AC input at least input, just like the SAMS says. this 3v may seem like not very much, but once it gets through the doubler + the RMS of everything, who knows.
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#15
08-22-2022, 06:41 PM
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You still have yet to determine what the Ma load is at the point between the connection of x2/c1 – L54, as mentioned, you will have to put your amp meter in series to see if you have excessive load , more than 580 ma,
and as been mentioned by others, check for voltage drop across circuit breaker M7. Check for 147vAC on the secondary. Check for voltage drop across plug & Socket 2 ( 9 – 8 ) And if you STILL find nothing, & current is within normal, your voltage doubler could simply be under preforming with your chosen new caps. I would still recommend larger ones 180uf @200 647-UCY2D181MHD3 and these diodes 78-SF4007 I have used this combo many times w/o any problems.
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