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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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11th Feb 2023, 10:42 pm | #1 |
Diode
Join Date: Feb 2023
Location: London, UK.
Posts: 4
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Hacker Gondolier capacitor
Hi - new member here.
I'm servicing a Hacker Gondolier and noticed that the machine I have has a 0.001uF capacitor across the output transformer. This doesn't appear on the schematic, and I haven't seen it in the various posts/YouTube videos I've come across. Can anyone tell me what this capacitor is for? |
12th Feb 2023, 1:38 am | #2 |
Tetrode
Join Date: Feb 2020
Location: Cheltenham, Gloucestershire, UK.
Posts: 82
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Re: Hacker Gondolier capacitor
I think I came across this once and seem to remember it was because someone had replaced the original amp with one from a Cavalier.
Bill |
12th Feb 2023, 10:21 am | #3 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,820
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Re: Hacker Gondolier capacitor
Or does the empty socket mounting hole suggest it was from a SERENADE (RG16) ?
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12th Feb 2023, 10:57 am | #4 |
Diode
Join Date: Feb 2023
Location: London, UK.
Posts: 4
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Re: Hacker Gondolier capacitor
Ahha - I should learn to check carefully - the machine is in fact a Cavalier!
Is a capacitor like this worth changing? It looks like the grid coupling capacitors have already been replaced, so my original plan was just to change the electrolytics and a couple of resistors that are out of tolerance... Last edited by paulsherwin; 12th Feb 2023 at 11:21 am. Reason: To comply with forum rules |
13th Feb 2023, 12:22 am | #5 |
Moderator
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 7,219
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Re: Hacker Gondolier capacitor
I would regard any supermold capacitors with suspicion.
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13th Feb 2023, 12:21 pm | #6 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
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Re: Hacker Gondolier capacitor
If the capacitor is across the O/P TX primary, its leaky or S/C failure wouldn't damage anything though it would affect the output sound to a greater or lesser extent. Worth replacing though and stay with the high voltage rating. Transients from record scratches or noisy pots etc. can develop seriously high peak voltages across the O/P TX primary!
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13th Feb 2023, 3:02 pm | #7 |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
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Re: Hacker Gondolier capacitor
On the Hacker Cavalier schematic (on radiomuseum) identified as G.P.15, it does not show the capacitor across T2 primary.
However on the right hand side Issues column, there is a note saying R17 6.8K and C14 .001 added in series across prim T2, then a later note saying R17 & C14 deleted across O/P trans prim. Plus other notes. David Edit Update - The capacitor is shown in photo on radiomuseum. Last edited by DMcMahon; 13th Feb 2023 at 3:09 pm. Reason: Update |
22nd Mar 2023, 8:38 pm | #8 |
Diode
Join Date: Feb 2023
Location: London, UK.
Posts: 4
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Re: Hacker Gondolier capacitor
Thanks for the help - both here and elsewhere on this forum. I’m pleased to say the Cavalier now has new capacitors and is working very nicely!
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