Pye achoic 1005 transistorised. Hot volume knob and buzzing noise - UK Vintage Radio Repair and Restoration Discussion Forum

andyhunterart · 22nd Nov 2013, 9:08 pm

My Pye Achoic has developed a hot volume control knob and a buzzing noise. This noise happens approximately twenty minutes after turning the record player on. Has anybody on this forum experienced the same problem?

Thanks.

Stylo N M · 22nd Nov 2013, 10:17 pm

Hi there,
I'm struggling to understand how the volume pot is becoming hot, considering the typical nature of most vintage record player circuits, unless there's somethng radically wrong. The only thing I can think of is to check the chassis for "LIVE", and check to see what voltages are flowing to earth which maybe causing the framework to heat up. As regards the delayed hum on warm up, then you've either got a dodgy capacitor on the output stage or a resistor is going low somewere.

Paul.

ben · 23rd Nov 2013, 12:13 am

Hot knob, oo-er missus! Still, as faults go that's a new one!

Seriously now, these players usually had a valve amp crammed onto a metal chassis, they did get pretty hot in use - and twenty mins is more than enough for a warmup time. Could it be possible that the thing is just acting normally? Another matter is if it is literally too hot to touch, that might be cause for concern.

Michael Maurice · 23rd Nov 2013, 12:27 am

If of course the amplifier has never been serviced and has those horrible hunts capacitors in it, that could cause it to overheat.

You need to dismantle the player remove the amplifier and inspect it.

If there are any brown or black Hunts capacitors, they will need replacing.

andyhunterart · 23rd Nov 2013, 1:09 am

Thank you Forum for all for your projected diagnostics. This problem only developed when I was using it on a particularly hot summers day, if this adds any logic to the possible culprit.

I have not serviced the amp since I have had it Maurice.

Tractorfan · 23rd Nov 2013, 1:33 pm

Hi,
If the volume control is combined with the mains on/off switch, I wonder if it's not closing fully and arcing at the contacts? This would cause heat which could be conducted along the shaft, and also create buzzing noises, possibly.
Cheers, Pete.

Nickthedentist · 23rd Nov 2013, 3:10 pm

Whatever's causing it, don't use the machine again until it's sorted!!

Stylo N M · 24th Nov 2013, 11:09 am

Hi all,
It certainly looks very much like the Pye 1005, acording to the radio museum search it incorparates 16 transistors, and 6 loudspeakers developed for stereo projection

.

Paul.

Station X · 24th Nov 2013, 11:35 am

Thread tidied up. Model number included in thread title. Picture moved to first post. Redundant posts deleted.

Steve_P · 24th Nov 2013, 12:58 pm

Is it just the On/Off pot that is getting warm? Are the others doing it too?
When the fault occurs, have a prod with the meter around the bridge rectifier - it may be breaking down.
Try disconnecting each side in turn - they are the same - and see if the fault clears.
Smoothers OK?
Leakage across the board when it gets warm?

Cheers,

Steve P.

22nd Nov 2013, 9:08 pm	#1
andyhunterart Retired Dormant Member Join Date: Sep 2012 Location: Wells, Somerset, UK. Posts: 4	Pye achoic 1005 transistorised. Hot volume knob and buzzing noise My Pye Achoic has developed a hot volume control knob and a buzzing noise. This noise happens approximately twenty minutes after turning the record player on. Has anybody on this forum experienced the same problem? Thanks. Attached Thumbnails

22nd Nov 2013, 10:17 pm	#2
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: Pye achoic hot volume knob and buzzing noise Hi there, I'm struggling to understand how the volume pot is becoming hot, considering the typical nature of most vintage record player circuits, unless there's somethng radically wrong. The only thing I can think of is to check the chassis for "LIVE", and check to see what voltages are flowing to earth which maybe causing the framework to heat up. As regards the delayed hum on warm up, then you've either got a dodgy capacitor on the output stage or a resistor is going low somewere. Paul.

23rd Nov 2013, 12:13 am	#3
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Pye achoic hot volume knob and buzzing noise Hot knob, oo-er missus! Still, as faults go that's a new one! Seriously now, these players usually had a valve amp crammed onto a metal chassis, they did get pretty hot in use - and twenty mins is more than enough for a warmup time. Could it be possible that the thing is just acting normally? Another matter is if it is literally too hot to touch, that might be cause for concern. __________________ Regards, Ben.

23rd Nov 2013, 12:27 am	#4
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,224	Re: Pye achoic hot volume knob and buzzing noise If of course the amplifier has never been serviced and has those horrible hunts capacitors in it, that could cause it to overheat. You need to dismantle the player remove the amplifier and inspect it. If there are any brown or black Hunts capacitors, they will need replacing. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

23rd Nov 2013, 1:09 am	#5
andyhunterart Retired Dormant Member Join Date: Sep 2012 Location: Wells, Somerset, UK. Posts: 4	Re: Pye achoic hot volume knob and buzzing noise Thank you Forum for all for your projected diagnostics. This problem only developed when I was using it on a particularly hot summers day, if this adds any logic to the possible culprit. I have not serviced the amp since I have had it Maurice. Last edited by AC/HL; 23rd Nov 2013 at 3:06 am. Reason: Readability

23rd Nov 2013, 1:33 pm	#6
Tractorfan Dekatron Join Date: Mar 2008 Location: St. Frajou, l'Isle en Dodon, Haute Garonne, France.(Previously: Ellesmere Port, Cheshire, UK.) Posts: 3,183	Re: Pye achoic hot volume knob and buzzing noise Hi, If the volume control is combined with the mains on/off switch, I wonder if it's not closing fully and arcing at the contacts? This would cause heat which could be conducted along the shaft, and also create buzzing noises, possibly. Cheers, Pete. __________________ "Hello?, Yes, I'm on the train, I might lose the signal soon as we're just going into a tunn..." Last edited by Tractorfan; 23rd Nov 2013 at 1:37 pm. Reason: extra worms

23rd Nov 2013, 3:10 pm	#7
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,844	Re: Pye achoic hot volume knob and buzzing noise Whatever's causing it, don't use the machine again until it's sorted!!

24th Nov 2013, 11:09 am	#8
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: Pye achoic hot volume knob and buzzing noise Hi all, It certainly looks very much like the Pye 1005, acording to the radio museum search it incorparates 16 transistors, and 6 loudspeakers developed for stereo projection . Paul.

24th Nov 2013, 11:35 am	#9
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Pye achoic 1005 transistorised. Hot volume knob and buzzing noise Thread tidied up. Model number included in thread title. Picture moved to first post. Redundant posts deleted. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

24th Nov 2013, 12:58 pm	#10
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Pye achoic 1005 transistorised. Hot volume knob and buzzing noise Is it just the On/Off pot that is getting warm? Are the others doing it too? When the fault occurs, have a prod with the meter around the bridge rectifier - it may be breaking down. Try disconnecting each side in turn - they are the same - and see if the fault clears. Smoothers OK? Leakage across the board when it gets warm? Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?