Dynatron HFC 51 | Two issues - UK Vintage Radio Repair and Restoration Discussion Forum

19Seventy7 · 4th Sep 2018, 8:45 pm

I have had my Dynatron for just over a year now, and I have never had these happen until now.

Issue 1) The turntable now takes a lot (and I mean a lot) longer to get up to correct speed by itself. It can maintain that speed, but struggles to get to it. (I just push the platter round myself so it has the boost to get to correct speed.

I have checked the motor and belt and both seem fine.

Any ideas as to why and how I can fix this?

Issue 2) I can be playing an album or a few singles and then there is a "pop" from the speakers, and the volume is louder, only slightly louder, but definitely noticeable.

Any ideas as to why and how I can fix this?

Nuvistor · 4th Sep 2018, 8:58 pm

Which turntable does it use?

19Seventy7 · 4th Sep 2018, 9:01 pm

Quote:

Originally Posted by Nuvistor

Which turntable does it use?

Goldring G101

Michael Maurice · 5th Sep 2018, 12:05 am

Most likely in need of a new belt and the turntable bearing needs cleaning and relubricating.

19Seventy7 · 5th Sep 2018, 12:54 am

Oh okay, thank you.

Do you know where I can get an affordable belt? I've look online and they are either ridiculous prices which I can't afford or out of stock.

Thanks

'LIVEWIRE?' · 5th Sep 2018, 7:57 am

Firms such as CPC and Cricklewood Electronics stock wide ranges of drive belts at reasonable prices. As the existing belt is likely to have stretched, my suggestion is that you measure the diameter of this, then subtract about 5% from this figure, and order the nearest available diameter belt to that. The width of the belt could be critcal, so measure that as well.

Nickthedentist · 5th Sep 2018, 8:11 am

Mike,

This is the deck that originally had a triangular cross-section belt fitted, which has caused much discussion on the forum recently.

N.

Nuvistor · 5th Sep 2018, 9:18 am

A couple of USA companies have belts, you need to confirm with them if the are the correct profile though. Around $20, don’t know if you feel that is expensive.

Has Nick stated there was much discussion about this on the forum, search the forum for the posts.

'LIVEWIRE?' · 5th Sep 2018, 12:03 pm

I didn't realize that the G101 used a triangular belt. AFAIK, Firms like CPC, Cricklewood, etc., don't stock triangular belts, although a square cross-section belt of the correct dimensions may be suitable

19Seventy7 · 5th Sep 2018, 9:48 pm

I did actually read these threads but they linked to the out of stock belts or expensive belts. (Expensive for me as im only on a small budget.)

Thanks for all the replies though! I'll look on this US website.

RojDW48 · 6th Sep 2018, 12:17 am

The belt might respond to a bit of acetone (it tends to revive rubber) wet a cotton pad with it and wipe the whole belt - also clean the drive spindle and platter rim. Not expensive for a little bottle from your local pharmacist and it might save a few pounds - and it's always useful for reviving half dead idler wheels and the like.

Techman · 6th Sep 2018, 12:38 am

I like Acetone, but be warned, plastic parts only need to get a sniff of it to be totally ruined.

19Seventy7 · 6th Sep 2018, 3:21 am

i shall give Acetone a try, I'll be sure not to get it near plastics then!

I would much rather keep the original belt too, as it is all original and I'm all about originality. (As long as original works.)

Diabolical Artificer · 6th Sep 2018, 6:05 am

Re Q2 could be a dry or loose joint. Try looking at the board with a magnifying glass and poking the PCB with a stick, whilst on that is.

Andy.

19Seventy7 · 6th Sep 2018, 4:42 pm

Touch wood, it has been working fine since the day I posted that. (I use the player everyday and all day when I'm at home.)

I don't really want to mess around with the board at the moment when its working, but ill keep that in mind. Thank you.

4th Sep 2018, 8:45 pm	#1
19Seventy7 Octode Join Date: Jun 2018 Location: Essex, UK. Posts: 1,307	Dynatron HFC 51 \| Two issues I have had my Dynatron for just over a year now, and I have never had these happen until now. Issue 1) The turntable now takes a lot (and I mean a lot) longer to get up to correct speed by itself. It can maintain that speed, but struggles to get to it. (I just push the platter round myself so it has the boost to get to correct speed. I have checked the motor and belt and both seem fine. Any ideas as to why and how I can fix this? Issue 2) I can be playing an album or a few singles and then there is a "pop" from the speakers, and the volume is louder, only slightly louder, but definitely noticeable. Any ideas as to why and how I can fix this?

4th Sep 2018, 8:58 pm	#2
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Dynatron HFC 51 \| Two issues Which turntable does it use? __________________ Frank

5th Sep 2018, 12:05 am	#4
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,225	Re: Dynatron HFC 51 \| Two issues Most likely in need of a new belt and the turntable bearing needs cleaning and relubricating. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

5th Sep 2018, 12:54 am	#5
19Seventy7 Octode Join Date: Jun 2018 Location: Essex, UK. Posts: 1,307	Re: Dynatron HFC 51 \| Two issues Oh okay, thank you. Do you know where I can get an affordable belt? I've look online and they are either ridiculous prices which I can't afford or out of stock. Thanks

5th Sep 2018, 7:57 am	#6
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Dynatron HFC 51 \| Two issues Firms such as CPC and Cricklewood Electronics stock wide ranges of drive belts at reasonable prices. As the existing belt is likely to have stretched, my suggestion is that you measure the diameter of this, then subtract about 5% from this figure, and order the nearest available diameter belt to that. The width of the belt could be critcal, so measure that as well.

5th Sep 2018, 8:11 am	#7
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,865	Re: Dynatron HFC 51 \| Two issues Mike, This is the deck that originally had a triangular cross-section belt fitted, which has caused much discussion on the forum recently. N.

5th Sep 2018, 9:18 am	#8
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Dynatron HFC 51 \| Two issues A couple of USA companies have belts, you need to confirm with them if the are the correct profile though. Around $20, don’t know if you feel that is expensive. Has Nick stated there was much discussion about this on the forum, search the forum for the posts. __________________ Frank

5th Sep 2018, 12:03 pm	#9
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Dynatron HFC 51 \| Two issues I didn't realize that the G101 used a triangular belt. AFAIK, Firms like CPC, Cricklewood, etc., don't stock triangular belts, although a square cross-section belt of the correct dimensions may be suitable

5th Sep 2018, 9:48 pm	#10
19Seventy7 Octode Join Date: Jun 2018 Location: Essex, UK. Posts: 1,307	Re: Dynatron HFC 51 \| Two issues I did actually read these threads but they linked to the out of stock belts or expensive belts. (Expensive for me as im only on a small budget.) Thanks for all the replies though! I'll look on this US website.

6th Sep 2018, 12:17 am	#11
RojDW48 Nonode Join Date: Jun 2014 Location: Bristol, UK. Posts: 2,074	Re: Dynatron HFC 51 \| Two issues The belt might respond to a bit of acetone (it tends to revive rubber) wet a cotton pad with it and wipe the whole belt - also clean the drive spindle and platter rim. Not expensive for a little bottle from your local pharmacist and it might save a few pounds - and it's always useful for reviving half dead idler wheels and the like. __________________ '....don't go mistaking Paradise for that home across the road!' (Bob Dylan)

6th Sep 2018, 12:38 am	#12
Techman Dekatron Join Date: Nov 2009 Location: Lincolnshire, UK. Posts: 5,000	Re: Dynatron HFC 51 \| Two issues I like Acetone, but be warned, plastic parts only need to get a sniff of it to be totally ruined.

6th Sep 2018, 3:21 am	#13
19Seventy7 Octode Join Date: Jun 2018 Location: Essex, UK. Posts: 1,307	Re: Dynatron HFC 51 \| Two issues i shall give Acetone a try, I'll be sure not to get it near plastics then! I would much rather keep the original belt too, as it is all original and I'm all about originality. (As long as original works.)

6th Sep 2018, 6:05 am	#14
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,670	Re: Dynatron HFC 51 \| Two issues Re Q2 could be a dry or loose joint. Try looking at the board with a magnifying glass and poking the PCB with a stick, whilst on that is. Andy. __________________ Curiosity hasn't killed this cat...so far.

6th Sep 2018, 4:42 pm	#15
19Seventy7 Octode Join Date: Jun 2018 Location: Essex, UK. Posts: 1,307	Re: Dynatron HFC 51 \| Two issues Touch wood, it has been working fine since the day I posted that. (I use the player everyday and all day when I'm at home.) I don't really want to mess around with the board at the moment when its working, but ill keep that in mind. Thank you.