HMV Radiogram Model 2342 Speed Calibration - UK Vintage Radio Repair and Restoration Discussion Forum

otronics · 16th Jun 2017, 1:24 am

I have almost finished restoring my HMV Radiogram Model 2342.

I cannot find how to calibrate the turntable speed (all speeds are running a little fast).

Can it be done?

Many thanks.

Oliver.

Station X · 16th Jun 2017, 8:00 am

Is this fitted with a BSR UA15 deck?

If so there is no speed calibration as such. Some times the motor mounting grommets perish, the motor drops and the idler doesn't sit correctly on the motor pulley.

Edward Huggins · 16th Jun 2017, 9:08 am

This Radiogram is fitted with a BSR C series (C123?) autochanger and as far as I know the speeds on this cannot be varied. Have you tried testing it with a Strobe? If you don't have one it can be downloaded. There is often about a + or - 3% speed variation on these.

'LIVEWIRE?' · 16th Jun 2017, 11:03 am

AFAIK, there was never any speed clibration on any BSR, or for that matter, Garrard, Collaro, Philips, or other make of Autochanger. They all used shaded pole AC motors whose rotational speed was/is synchronised to the mains frequency, and, as Edward says a tolerance of maybe +/- 3% of nominal speed was considered acceptable.

otronics · 16th Jun 2017, 9:13 pm

I thought that might be the case.

I am using a strobe disc.

It is a BSR C109.

16th Jun 2017, 1:24 am	#1
otronics Retired Dormant Member Join Date: Jul 2016 Location: Warminster, Wiltshire, UK. Posts: 15	HMV Radiogram Model 2342 Speed Calibration I have almost finished restoring my HMV Radiogram Model 2342. I cannot find how to calibrate the turntable speed (all speeds are running a little fast). Can it be done? Many thanks. Oliver.

16th Jun 2017, 8:00 am	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: HMV Radiogram Model 2342 Speed Calibration Is this fitted with a BSR UA15 deck? If so there is no speed calibration as such. Some times the motor mounting grommets perish, the motor drops and the idler doesn't sit correctly on the motor pulley. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

16th Jun 2017, 9:08 am	#3
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,338	Re: HMV Radiogram Model 2342 Speed Calibration This Radiogram is fitted with a BSR C series (C123?) autochanger and as far as I know the speeds on this cannot be varied. Have you tried testing it with a Strobe? If you don't have one it can be downloaded. There is often about a + or - 3% speed variation on these. __________________ Edward.

16th Jun 2017, 11:03 am	#4
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: HMV Radiogram Model 2342 Speed Calibration AFAIK, there was never any speed clibration on any BSR, or for that matter, Garrard, Collaro, Philips, or other make of Autochanger. They all used shaded pole AC motors whose rotational speed was/is synchronised to the mains frequency, and, as Edward says a tolerance of maybe +/- 3% of nominal speed was considered acceptable.

16th Jun 2017, 9:13 pm	#5
otronics Retired Dormant Member Join Date: Jul 2016 Location: Warminster, Wiltshire, UK. Posts: 15	Re: HMV Radiogram Model 2342 Speed Calibration I thought that might be the case. I am using a strobe disc. It is a BSR C109.