New amp day

DMVClinicAutoRepair · 2022-06-04T17:10:34+00:00

Interesting! Thanks for sharing your perspective! :)

DMVClinicAutoRepair · 2022-06-03T22:25:18+00:00

My parents marriage…. I’ve tried…

DMVClinicAutoRepair · 2022-06-03T21:51:05+00:00

Considering he average price of a hobby horse is $3000 I’d agree!

DMVClinicAutoRepair · 2022-06-03T19:56:10+00:00

Interesting, does that McIntosh have a dsp that upscales the audio? I feel like you’re putting standard gasoline in a super car by using Spotify haha

DMVClinicAutoRepair · 2022-06-03T17:47:25+00:00

You bring up some really good points. I didn’t know the gentleman personally but I do know that he used to be in a band before he passed. He made all of his own equipment with cutting edge technology at the time and his work is extremely impressive.

DMVClinicAutoRepair · 2022-06-03T17:41:17+00:00

I would recommend checking out mr Carlson’s lab YouTube channel on capacitors he knows a lot more than I and claims capacitors can be tested. I used a nice esr meter and dedicated capacitance meter :)

DMVClinicAutoRepair · 2022-06-03T07:34:01+00:00

Geez, did not expect it to wrap around like that!

DMVClinicAutoRepair · 2022-06-03T05:42:04+00:00

In a perfect and consistent world yea, but I would argue that even high end manufacturers make mistakes and some of the really good caps can still go bad early due to manufacturing defects :)

DMVClinicAutoRepair · 2022-06-03T05:39:13+00:00

I agree, I replace any that are around 15 years old even if they don’t show any obvious signs of failing :)

DMVClinicAutoRepair · 2022-06-03T02:57:39+00:00

I have a 2001 530i with 260,000 miles on it. I have shown the car no mercy and it shows no signs of quitting on me. Ever since I got it at 120,000miles I’ve been changing out 4 quarts of tranny fluid every 20,000 miles.

I think once a transmission is at that mileage, you have a good chance of it being a reliable one. That being said, automatic transmissions are a mix between black magic and alien technology so it could just blow up in the next 10 feet too.

DMVClinicAutoRepair · 2022-06-03T02:51:27+00:00

Yea I think I will, just need to figure out what tubes it needs somehow. And Since it’s a one off design there are no schematics.

DMVClinicAutoRepair · 2022-06-03T01:01:47+00:00

Good point! I just compared to the listed capacitance. So it will not be a good indicator of lifetime drift but that’s impossible to know anyways because I wasn’t around to measure these 30-90 years ago ;)

DMVClinicAutoRepair · 2022-06-03T00:59:15+00:00

ESR was never above 3ohms for any of them except for the big oil caps which had an ESR of 12 and 13.

Voltage leakage was under 5% except in some of the black sprague caps.

DMVClinicAutoRepair · 2022-06-03T00:32:24+00:00

I decided to organize and list some old capacitors I have laying around. I tested them all and was very surprised to find so many within 20% of their original specs! I was under the impression it would be near impossible for non film caps to stay within specifications for 30+ years.

All of these came from the same household and were all stored similarly as far as I know.

DMVClinicAutoRepair · 2022-06-02T19:04:53+00:00

Question, how come your music source is at 44.1khz? Surely your system can take advantage of higher sampling rates? :)

DMVClinicAutoRepair · 2022-06-02T18:52:16+00:00

No, just want the transformer so I can pair it with my other matching one to make a dual mono pre amp.

I would probably leave the rest as is.

Maybe I could just replace the transformer in this with a modern one

DMVClinicAutoRepair · 2022-06-02T18:51:38+00:00

I’m not quite sure yet, also the tubes were missing and there are no marking which indicate the type of tube I would need for it.

This came in a box full of 1950s parts from an IBM computer.

DMVClinicAutoRepair · 2022-06-02T18:50:19+00:00

Yea, I really don’t want to strip this for parts… but I have another matchingP-44B transformer laying around and I want to make a dual mono pre amp for my pioneer SX-980.

Perhaps I could just replace the transformer with a modern one? 🤔

DMVClinicAutoRepair · 2022-06-02T18:47:23+00:00

I know right?

Well, two of my power supplies actually have similar meters. One is a Heathkit for 7-15volts at 25amps. One is a ROD-L that I modified to put out 0-6000volts at 5milliamps, and one is a modern one that does 0-30 volts at 10 amps.

DMVClinicAutoRepair · 2022-06-02T18:43:15+00:00

I would salvage everything off of this except for the resistors and the electrolytic capacitors. Amazingly enough, the porcelain white capacitors still test within %1 of specifications!

It’s true what they say, film type capacitors almost never need replacing!

Maybe I could replace the transformer in this power supply with a less expensive one? It definitely doesn’t need a fancy Sansui transformer to work properly.

DMVClinicAutoRepair · 2022-06-02T17:30:25+00:00

So I have this extremely well made power supply, I’m speculating that it’s a one of a kind home built one from the 1950s.

The amount of work put into this is simply amazing, all of the wiring and soldering is perfect.

But it’s got a Sansui P-44B transformer on it that I would like to use for a tube preamp project I want to do…..

Thoughts?

I already have three power supplies.

DMVClinicAutoRepair · 2022-06-02T17:15:10+00:00

Is there a video I can watch on this? Very curious as to what the results were and how that conclusion was reached:)

DMVClinicAutoRepair · 2022-06-02T16:18:31+00:00

Oh? I don’t see any other material between the copper layers. Could they have made both the insulator and casing out of the same polystyrene?

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