Help with Dynatron Calvacade music centre

[john.north]

Hello all,
There must be more than one strain of Goldring 101. My cavalcade deck has a flat belt. Dimensions 110 mm folded 220mm total. Diameter don’t know no good at maths. Width 3 mm. This is the original belt.
John.

['LIVEWIRE?']

220mm circumference = 70mm diameter, John. D = Oce (Circumference) divided by Pi (nominally 3.1412). Conversely Oce = Pi x D

[paullamey]

Thanks very much for all your advice. I'm pretty sure it's a flat belt I'll try and find a replacement online. I've ordered a bulk load from China but will also see if i can find the original.

If it's a problem with the synchronous motor, what's the best way of finding that out / fixing it? I guess it's to take it to a specialist repair person who will know a lot more than me

Thanks again.

Paul

[paullamey]

Originally Posted by john.north

There must be more than one strain of Goldring 101. My cavalcade deck has a flat belt. Dimensions 110 mm folded 220mm total. Diameter don’t know no good at maths. Width 3 mm. This is the original belt.

I checked the belt the guy who came to fix it used yesterday and it seems to be a touch big, maybe by about 5mm. And it's only 2mm in width.

Does anyone know where I can get hold of one? Thanks loads.

[john.north]

Hello,
Malvern belts. Is your belt 110mm when folded flat? If so I have two I will send if you can’t find one. Pm with details.
John.

[19Seventy7]

Originally Posted by paullamey

Hello!

I was given an old calvacade music centre SRX30B It's really beautiful but am aware that the record player a Goldring G101 isn't the best. It plays at inconsistent speeds, mostly a fraction slower. I had a vintage repair man come out - which was a really bad experience. He turned up at 11 at night - charged me £100 and told me, after doing some poking around, that record players in the 70s never played to true speeds. He changed the belt but i don't know if it was even the correct one.

I don't really know what to do next! Any advice would be great. I apologise for my naivety!

Thanks!

Hi, I don't know what could be the problem, but I have a HFC 51, which also has a goldring G101 which is playing at the perfect speeds, on 45 rpms and 33 rpms, I just thought I would tell you to let you know you can get it to run at perfect speed.

[Michael Maurice]

This deck uses a synchronous motor and was fitted with a triangular belt which is no longer available. There is no speed adjustment.

The way the triangular belt works is that the pointed part fits into the groove of the motor pulley, whilst the flat portion is on the turntable hub. The belt does twist between the pulley and turntable hub but it stays with the same twist, ie 60 degrees between motor and turntable and -60 degrees between turntable and motor.

For this reason a square belt is unlikely to work and could cause more problems than it solves.

Most belts available today are 1.2mm square cross section which is probably too small to drive a heavy turntable, but more to the point, it probably will twist as the turntable rotates, which will be audible and annoying. It probably wouldn't last very long either.

If you put a tighter belt on it, you run the risk of damaging the motor and possibly the turntable bearings.

The only thing that might work is a flat belt which is just 3 - 4 mm wide and very thin, but again try finding one.