I work on these amps all the time - fantastic job! Those can caps are frequent flyer offenders, as are all the paper caps. That 470 ohm resistor is used as a fusible resistor and is often high in value if not burned up. Also, the 220k and 56k resistors are usually drifted high in value. Thank you for this video and part 2.. I enjoyed it.
In the mid 1960’s I worked at the Leslie organ factory in Pasadena, CA. I built the motor assemblies for the Leslie rotating speaker baffles. The more senior techs built the electronics...
Have used the same similar cap. tester for years, & was never shown or knew what the power factor knob did. Thank you for that. Still not 100% sure, but definitely the leakage test. Yes, the digital ones do show correct value on bad/leaky caps., no help when trying to find the leaky ones. A rebuilder I once knew was using NOS electrolytics in rebuilds & most/all were leaky when using the eye versus fresh new caps. He stopped using them.
Yes, the power factor knob is rotated for maximum opening of the eye. Once the knob is set for maximum opening, take note of what number the knob is pointing to and that will be the percent power factor.
I've seen some 5U4s that had the filament burned out too but can't recall seeing one that shorted out, like 5Z3s and 80s they seem to be a fool proof design if operated withing specs. Speaking of diodes all of these people needlessly replacing 6X5s with silicon diodes are going to get that nasty surprise one day.
I've already been thinking about that and I will check the B+ voltage, just to make sure. Another reason I think a tube would be best is because the tube is less likely to short than the diodes.
The power factor knob is used to test the ESR (Equivalent Series Resistance) of the cap under test. This figure should be as low as possible. Believe you look for an indication on the "eye tube" while turning that knob and note the number that it points to.
I no its a old video now but thanks foe the info. I just picked up a Leslie 44 with 4 6v6 tubes, but its 70v line output and also 2 ao-43amps. All 3 need recap and some tubes.
You can buy an exact replacement new electrolytic capacitor from "Tonewheel General Hospital". It is a newly made multi-section electrolytic can of the proper rating. You will just need to snip off the appropriate tab on the new one to get it to fit in the socket.
Can you tell me of a good place to order capacitors from, thank you so much and I also really enjoy your videos they're very informative and enlightening thanks and keep up the good work.
Ah yes, replace rectifier tubes with silicon diodes. Solid state loves to fail as a short. Don't want to see the aftermath. Already see it with SCRs, IGBTs, FETs etc in high power inverters and rectifiers. POW!
I work on these amps all the time - fantastic job! Those can caps are frequent flyer offenders, as are all the paper caps. That 470 ohm resistor is used as a fusible resistor and is often high in value if not burned up. Also, the 220k and 56k resistors are usually drifted high in value. Thank you for this video and part 2.. I enjoyed it.
In the mid 1960’s I worked at the Leslie organ factory in Pasadena, CA. I built the motor assemblies for the Leslie rotating speaker baffles. The more senior techs built the electronics...
Have used the same similar cap. tester for years, & was never shown or knew what the power factor knob did. Thank you for that. Still not 100% sure, but definitely the leakage test. Yes, the digital ones do show correct value on bad/leaky caps., no help when trying to find the leaky ones. A rebuilder I once knew was using NOS electrolytics in rebuilds & most/all were leaky when using the eye versus fresh new caps. He stopped using them.
I've seen a few weak 5U4's in sets that were ran into the ground; but, I don't recall ever seeing a shorted one.
The old cap cans are available through CE Manufacturing.
Yes, the power factor knob is rotated for maximum opening of the eye. Once the knob is set for maximum opening, take note of what number the knob is pointing to and that will be the percent power factor.
brilliant video as always, respect from the UK
I've seen some 5U4s that had the filament burned out too but can't recall seeing one that shorted out, like 5Z3s and 80s they seem to be a fool proof design if operated withing specs. Speaking of diodes all of these people needlessly replacing 6X5s with silicon diodes are going to get that nasty surprise one day.
I've already been thinking about that and I will check the B+ voltage, just to make sure. Another reason I think a tube would be best is because the tube is less likely to short than the diodes.
The power factor knob is used to test the ESR (Equivalent Series Resistance) of the cap under test. This figure should be as low as possible. Believe you look for an indication on the "eye tube" while turning that knob and note the number that it points to.
I no its a old video now but thanks foe the info. I just picked up a Leslie 44 with 4 6v6 tubes, but its 70v line output and also 2 ao-43amps. All 3 need recap and some tubes.
My mother laughed for a mile @ 0:47. And so did I. And for that we thank you! Keep up the great videos!
can't find part 2
The 22H amps were used in the 22H and 22R and RV Leslies between 1958 and 1963 or so.
Nice job troubleshooting those amps! Yup, gotta replace the 'Lytics! (Crapped Out Caps)
You can buy an exact replacement new electrolytic capacitor from "Tonewheel General Hospital". It is a newly made multi-section electrolytic can of the proper rating. You will just need to snip off the appropriate tab on the new one to get it to fit in the socket.
Nice bits of kit!!!
Can you tell me of a good place to order capacitors from, thank you so much and I also really enjoy your videos they're very informative and enlightening thanks and keep up the good work.
I just got the parts in; so, probably this weekend or early next week.
Yes.
Thank you for that information.
Hi: The wrong thumb picture is on this one. It has a Eico tester...Wrong one.
Yes, when those diodes short, they sure will.
Ah yes, replace rectifier tubes with silicon diodes. Solid state loves to fail as a short. Don't want to see the aftermath. Already see it with SCRs, IGBTs, FETs etc in high power inverters and rectifiers. POW!
dang u ain't a foolin
GIL MAG SOUND RIO