HMV stereogram model 2032 help needed - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

dazzlevision · 1st Feb 2024, 8:10 am

I have a similar HMV Stereomaster (model 2401) unit to yours, albeit with VHF stereo radio added. Here's the link to my restoration thread, which you might find informative:

https://www.vintage-radio.net/forum/...ad.php?t=92669

dazzlevision · 1st Feb 2024, 8:34 am

Quote:

Originally Posted by Stephen1961

.......I guess he added the capacitors on the mains switch - I can't see those on the circuit diagram either. I wish he was still around to ask why!! What purpose would these mods be for does anyone think?

They serve to reduce mains borne interference, which might otherwise be heard as pops or clicks through the speakers.

Stephen1961 · 1st Feb 2024, 1:01 pm

Thank you for the tips and safety advice. I presume the capacitors added across the mains input would have been to reduce mains noise. One of the additions I do know my father made was to add a headphone socket switch box which sat below the stereogram. It was broken and I removed it when I took the chassis out. I wonder if there was an unacceptable hum whilst listening through headphones and this was why he added the capacitors. Can't really think of why the he should have put them in?

1st Feb 2024, 8:10 am	#21
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,629	Re: HMV stereogram model 2032 help needed I have a similar HMV Stereomaster (model 2401) unit to yours, albeit with VHF stereo radio added. Here's the link to my restoration thread, which you might find informative: https://www.vintage-radio.net/forum/...ad.php?t=92669

1st Feb 2024, 1:01 pm	#23
Stephen1961 Diode Join Date: Jan 2024 Location: Bournemouth, Dorset, UK. Posts: 6	Re: HMV stereogram model 2032 help needed Thank you for the tips and safety advice. I presume the capacitors added across the mains input would have been to reduce mains noise. One of the additions I do know my father made was to add a headphone socket switch box which sat below the stereogram. It was broken and I removed it when I took the chassis out. I wonder if there was an unacceptable hum whilst listening through headphones and this was why he added the capacitors. Can't really think of why the he should have put them in?