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Old 2nd September 2019, 03:15 PM   #1
mgitterle is offline mgitterle  United States
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Default Problem with Tubelab SE 45 after connecting oil cap

Hi everyone,
I'm stumped. I connected a 100uF motor start cap in parallel with C5 (as that seemed to be the recommendation as best I could glean).

From that moment, I had no more output from my speakers. 5842s still at 175, and I seem to have 30mA at the output tubes.

Any suggestions would be appreciated.

Marc
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Old 2nd September 2019, 04:02 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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What is C5? Perhaps a pic can help us to help you :-)
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Old 2nd September 2019, 04:23 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Quote:
Originally Posted by mgitterle View Post
Hi everyone,
I'm stumped. I connected a 100uF motor start cap in parallel with C5 (as that seemed to be the recommendation as best I could glean).

From that moment, I had no more output from my speakers. 5842s still at 175, and I seem to have 30mA at the output tubes.

Any suggestions would be appreciated.

Marc
What did you expect by increasing the value of C5?
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Old 2nd September 2019, 04:24 PM   #4
Andrewbee is offline Andrewbee  Jamaica
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First step I would take is double check you are infact paralleling C5 and have not made a mistake with the connections.

Secondly, remove the 100uF capacitor you just added and see where you are wrt voltages.
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Old 2nd September 2019, 04:30 PM   #5
Tubelab_com is offline Tubelab_com  United States
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Does the output return if the cap is removed?

Connecting a cap in parallel with C5 should not affect the sound if the tube current and B+ voltage is still good. Perhaps something else got disconnected or shorted out. Are you sure your new cap is grounded to board ground?

This should not affect the sound, but you should not use a motor START cap. They are usually a type of non-polarized electrolytic that is used temporarily to START a motor, and not meant for continuous use. They will not improve the sound, and have been known to fail, often in an ugly manner.

You should use a motor RUN cap, which is polypropylene and designed for continuous connection to the AC mains with large current flow. These have very low ESR and ESL, which improves the sound since it complements the characteristics of the on board power supply output electrolytic, C5.
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Old 2nd September 2019, 07:36 PM   #6
mgitterle is offline mgitterle  United States
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Thank you for the quick reply. I did not ground the cap body, but in fact simply connected the terminals of the cap (which I confirmed is in fact a "motor run" cap -- my bad!).

No sound at all now. I am going to go through checkout again and see what shakes out.I will check B+ againl.

This thing has me scratching my head.

Marc
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Old 2nd September 2019, 07:37 PM   #7
mgitterle is offline mgitterle  United States
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This was one of the upgrade recommendations in the manual; i.e. to add a Motor Run oil cap.
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Old 11th September 2019, 12:38 AM   #8
itsikhefez is online now itsikhefez  United States
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Problem with Tubelab SE 45 after connecting oil cap
Is this a TSE or TSE-II ?
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