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Old 22nd Oct 2021, 11:14 am   #1
Woody1963
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Default Help with smoothing capacitor on record player

Hi All

I’ve seen a couple of threads relating to smoothing capacitors. I am restoring a Portadyne 60s record player and have serviced all the mechanicals, I noticed a stain on the inside of the box under the smoothing cap, and was careful on applying volts, when I did there is a really loud hum, I assume the smoothing capacitor has gone and wondered if somebody would be prepared to repair the can or could help me repair (I’m in Telford, UK), photos attached. Label for type has PS1053/34 L1 J100

Thanks Dave
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Old 22nd Oct 2021, 11:36 am   #2
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Default Re: Help with smoothing capacitor on record player

Some suggestions on re stuffing the electrolytic capacitor.
https://vintage-radio.net/forum/showthread.php?t=161784
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Old 22nd Oct 2021, 11:58 am   #3
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Default Re: Help with smoothing capacitor on record player

Thanks Frank, think this might be beyond me skills to repair so if someone is prepared to look at the amp and repair for me that would be the best option thanks Dave
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Old 22nd Oct 2021, 3:15 pm   #4
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Default Re: Help with smoothing capacitor on record player

Quote:
Originally Posted by Woody1963 View Post
Hi All

I’ve seen a couple of threads relating to smoothing capacitors. I am restoring a Portadyne 60s record player and have serviced all the mechanicals, I noticed a stain on the inside of the box under the smoothing cap, and was careful on applying volts, when I did there is a really loud hum, I assume the smoothing capacitor has gone and wondered if somebody would be prepared to repair the can or could help me repair (I’m in Telford, UK), photos attached. Label for type has PS1053/34 L1 J100

Thanks Dave
Hi Dave I would replace the big wax capacitor under the valve first
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Old 22nd Oct 2021, 5:57 pm   #5
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Default Re: Help with smoothing capacitor on record player

Thanks Bob do you know where I can get one of these? I did wonder about that, if this is shot would it cause the loud hum?
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Old 22nd Oct 2021, 9:26 pm   #6
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Default Re: Help with smoothing capacitor on record player

Depends where it is in the circuit. If it's a grid coupling cap to the output valve, it could cause excessive current in that valve which might result in more hum but it's more likely that dried up electroytics in the can are to blame.

Dual 32uF caps are still fairly easy to find, the low voltage 25uF one can be fitted separately (as indeed could all three).

You're about an hour (40miles) away, fancy bringing it to Leominster?
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Old 23rd Oct 2021, 8:02 am   #7
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Default Re: Help with smoothing capacitor on record player

It's a single-stage amp so there's no grid-coupling cap, it's the variable tone control cap. I would have thought that re-stuffing the big cap can is a step too far? Yes, a dual 32F 350V (or 2 sperate ones) and a separate 25uF 25V cathode cap are readily available and will replace all those that were in the single can. If the OP can solder, he might find it easier to do that than he thinks.
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Old 23rd Oct 2021, 9:06 am   #8
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Default Re: Help with smoothing capacitor on record player

If the OP does that he should make sure that all the PCB lands to which the can's mounting tags are soldered are linked together as the connection between them is via the can.

If I were the OP I'd take up Herald's offer.
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Old 23rd Oct 2021, 9:48 am   #9
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Default Re: Help with smoothing capacitor on record player

Hi all.

Bit the bullet and started to desolder, yes the can is the negative so going to make sure all the connections that went to the can side are connected together with the neg ends of the capacitors. That then leaves the three pos ends of the caps to go the red, yellow and green connected wires. Having fun ������
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Old 23rd Oct 2021, 10:09 am   #10
Edward Huggins
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Default Re: Help with smoothing capacitor on record player

Start with the cathode cap (25uF 25V) that goes to pin 3 of the UL84 when viewed from underneath,
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Old 23rd Oct 2021, 10:58 am   #11
Woody1963
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Default Re: Help with smoothing capacitor on record player

Hi Edward nearest one I can find for the cathode cap is 33uf 25V unless you/anyone else can point me in the direction of one of the 25uf ones thanks Dave
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Old 23rd Oct 2021, 11:36 am   #12
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Default Re: Help with smoothing capacitor on record player

22uF or 33UF 25V both will be fine in this role.

Cheers

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Old 23rd Oct 2021, 11:57 am   #13
Woody1963
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Default Re: Help with smoothing capacitor on record player

Thanks Mike I’ll post on completion and let you all know if it’s a success - worried look lol
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Old 23rd Oct 2021, 3:32 pm   #14
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Default Re: Help with smoothing capacitor on record player

Whilst de-soldering the components I noticed that the wire going from terminal 4 on the valve to the negative on the can passes through the earth point connection and is not actually soldered but loose, I’m thinking this could actually be the cause of the loud hum as the can would floating. I’m going to continue to replace components but wondered if I was thinking correctly. Thanks Dave
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Old 23rd Oct 2021, 5:27 pm   #15
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Default Re: Help with smoothing capacitor on record player

UL84 pin 4 is one side of the heater. If it wasn't connected to ground then, depending on the routing of the wiring and PCB tracks, it's possible the valve wouldn't light up.
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Old 23rd Oct 2021, 6:01 pm   #16
Woody1963
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Default Re: Help with smoothing capacitor on record player

Hi Graham think that is what happened when I powered it up originally only one valve glowed, the one that didn’t I think was the one with this loose connection so that aligns with your comment. Just one question when I replace the capacitors s it OK to use circuit board or are the voltages too high? Thanks Dave
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Old 23rd Oct 2021, 6:45 pm   #17
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Default Re: Help with smoothing capacitor on record player

Quote:
Originally Posted by Woody1963 View Post
Hi Graham think that is what happened when I powered it up originally only one valve glowed, the one that didn’t I think was the one with this loose connection so that aligns with your comment.
So this is a two valve amplifier? I assumed it used a metal rectifier and a single valve. What valves are fitted?

Quote:
Originally Posted by Woody1963 View Post
Just one question when I replace the capacitors is it OK to use circuit board or are the voltages too high?

Thanks Dave
Sorry, but I don't understand that question.
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Old 23rd Oct 2021, 7:12 pm   #18
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Default Re: Help with smoothing capacitor on record player

I will be pleased to re stuff the can with modern day electrolytics and check the amplifier for you at cost plus postage back.
I have refurbished many with great success.
Please PM me if you would like to have it done.
Best regards.
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Old 23rd Oct 2021, 8:17 pm   #19
Woody1963
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Default Re: Help with smoothing capacitor on record player

Quote:
Originally Posted by Station X View Post
Quote:
Originally Posted by Woody1963 View Post
Hi Graham think that is what happened when I powered it up originally only one valve glowed, the one that didn’t I think was the one with this loose connection so that aligns with your comment.
So this is a two valve amplifier? I assumed it used a metal rectifier and a single valve. What valves are fitted?

Quote:
Originally Posted by Woody1963 View Post
Just one question when I replace the capacitors is it OK to use circuit board or are the voltages too high?

Thanks Dave
Sorry, but I don't understand that question.
I’m thinking about mounting the replacement capacitors on a piece of circuit board to make it easier to keep all the negatives together and to then connect the positive ends to the corresponding wires on the amp but wondered if this is the right approach, or is there a better way. Thanks Dave
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Old 23rd Oct 2021, 8:23 pm   #20
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Default Re: Help with smoothing capacitor on record player

Sorry, but I mistakenly thought the player used a Printed Circuit Board which it doesn't?

It's usual to mount replacement caps on tag strip. You can use circuit board, but make sure the tracks are wide and here's good separation between them.
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