Garrard 4Hf pulley questions - 50Hz to 60Hz

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dubstar
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Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by dubstar » 18 Feb 2019 16:40

(I have searched through several exisiting topics and still have questions)

Hello

I own a Garrard 4Hf that came set up for US power. All electronics work well, but the turntable is currently in the shop, as it was purchased with the small screw that adjusts the tonearm pressure spring possibly stripped. Hopefully the technician can repair it, but any advice on that is welcome.

My topic question involves the new 4Hf 50Hz version I just purchased. Voltage conversion will not be an issue, but the 50Hz / 60Hz issue will be. I understand the preferred "fix" is to install a 60Hz pulley. I have not been able to locate one for sale or trade, however.

The other option is purchasing a power / frequency converter with the existing 50Hz pulley. This looks like it will work:

https://www.kccscientific.com/product/a ... converter/

It is expensive, however. So if I cannot find a proper 60Hz pulley, my questions are:

1) Will the linked converter work - US 115v / 60Hz in and UK 230V / 50Hz out? It's rated at 40 watts output.

2) Will any other Garrard 60Hz pulley come "close" to maintaining proper speed? I see new 60Hz versions are available for the 301 and 401. I also have a 60Hz pulley from a Garrard 210 I can use if it fits.

To clarify, I know using a 60Hz pulley from another model (if it even fits) will be a workaround. I understand the increase in speed if I leave the 50Hz pulley installed with only voltage conversion (not frequency) will be around 18%. Any workaround would obviously need to have significantly less increase to be worthwhile. Also note 45 rpm will be the most often used record choice.

Thanks!

Chiltern
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Re: Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by Chiltern » 19 Feb 2019 01:07

Hi, welcome to VE.

I take it that your 'new' 4HF has been running on 120v but 50c/s. The motor is a 4 pole like a 210 but the 4HF platter is much larger so a 210 pulley will not solve the problem.
You could reduce the diameters of your 50c/s pulley if you can get the sizes from another deck. 301/401 pulleys are a completely different design.

Alan
Garrard 4HF, idler engaged.jpg
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dubstar
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Re: Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by dubstar » 19 Feb 2019 03:24

Thanks for the reply.

The 230v / 50Hz one is currently being shipped. The one I already have is 120v / 60Hz and has the appropriate 60Hz pulley, so the speed is correct.

So I can take both pulleys and have the 50Hz machined down to the size of the 60Hz version? Can any capable machine shop handle this?

Thanks!

Chiltern
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Re: Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by Chiltern » 19 Feb 2019 09:57

So the one you have is a 4HF(L) and the 'new' one a 4HF(H). The circuits for the speed control are different, as is the motor, so i would assume that you are going to use a transformer to provide the 230v.

As for finding a machine shop, that's the difficulty, not that it is much of a task, but the pulley must be kept concentric. Care is what is needed.

Good luck
Alan
4HF wiring diagram.jpeg
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dubstar
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Re: Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by dubstar » 19 Feb 2019 13:28

Yes, I will be using a transformer. The one I linked up above also has a frequency converter, so it outputs the proper voltage AND frequency cycle. It is expensive, however.

https://www.kccscientific.com/product/a ... converter/

Chiltern
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Re: Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by Chiltern » 19 Feb 2019 14:09

yes, that is expensive. just testing one of my 4HF, at 240v, draws 24w, 0.10 amp.

Fortunately I have a lathe, an old one (though not as old as I), from experience the time to machine items like pulleys, is in the setting up, the actual turning time is almost in seconds. You need someone with, perhaps a watchmakers lathe and patience.

As an aside, there are very few components in a 4HF that are common with other Garrards, it's a fairly unique machine. The speed control was always fragile, I bought a 4HF new back in the day (around 1960 IIRC), the regulator failed quickly and was replaced by the factory, with the recommendation of 'set it then leave it alone'. After a long gap, I came across a 4HF around 10 years ago and another a couple of years back. Available as a chassis and also with a metal plinth (very valuable now) in the UK they were also used in a well known console and that is where most are now found.

Alan

dubstar
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Re: Garrard 4Hf pulley questions - 50Hz to 60Hz

Post by dubstar » 19 Feb 2019 14:52

Thank you, Alan.

Yes, the 4HF was frequently used by early UK sound systems playing Jamaican reggae. The great soundman Jah Shaka still uses one today. I am a longtime reggae vinyl collector / selector here in New York, so the attraction is obvious. I currently run two Technics 1200 with Ortofon and Audio-Technica cartridges, depending on whether I am listening or playing records at an event. Garrards are not as common here. I have an RC 210 that was recently serviced and it looks and sounds great. It is a very fun and nice looking unit.

The 4HF (L) I have was purchased in very good condition for only $175 USD with the wood Garrard base. Everything checks out and is operating well except for the tonearm adjustment. It appears that the adjustment for the small screw in the left bushing is stripped; neither the small side screw or larger top screw have any effect on adjusting VTF. It is at a capable tech's shop now, but I am not sure he completely understands the Garrard tonearm system (he did a great job on the 210, however). It may need to go to a Garrard specialist who works a bit further away.

The new 4HF (H) that is being shipped to me comes with the metal plinth and is in mint condition both outside and in. Recently serviced and working perfectly. The price was comparable to recent sales I have tracked and well worth it.

So even though the KCC unit I linked is expensive, I may resort to buying that if I can not source a 60Hz pulley. I am not confident in reducing the 60Hz to the proper size myself, and I'm not sure I can find someone I trust to do it for me. At the very least, I can swap the 60Hz pulley from the 4HF (L) over to the new excellent condition 4HF (H) while I search for another pulley or save up for the KCC unit).

Thank you.

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