How to work out the correct size of drive belt to order

[@imagine9132]

omg u saved my turntable’s life

[@thedude8046]

Thanks for the explanation 👍

[@ruitravanca9059]

Many thanks for your help, very interesting info.

[@Belike36]

Awesome explanation and great quality video.Thanks for sharing.!:)

[@gbaudio1212]

You're welcome. Happy to help.

[@Equinoxio21]

Thank you, very helpful

[@aalan9489]

Thx very much , Idont know want to less 10-15mm for fit

[@gdlblues1]

Hello,I have a Aiwa model ap-1200c turntable.My belt size is the same as yours on the video.Can you tell me where you bought yours.I'm not having any luck finding one for my Aiwa. Thanks.

[@gbaudio1212]

There is a link to the online shop in the description text above.

[@brett5728]

Hi mate 👋 What would be the foldable length of your belt? Cheers love your Videos 👍

[@gbaudio1212]

Thanks for your praise. The total length of this belt (BELT41) is 640mm, so if you fold it flat it will measure 320mm.

[@greensombrero3641]

awesome - thank you for the help! respect!

[@gbaudio1212]

You're welcome. Happy to help.

[@myleftthumb2294]

Hello. I have a Nikko NP-500 table which measures exactly the same size. But, being a short-lived brand, I cannot seem to find any replacement parts for it. What is the model number of your Marantz so that I may just look that part up? Thanks.

[@gbaudio1212]

This turntable is A Marantz TT5005 and there is a link to the online shop in the description text above, where you will find the correct replacement belt.

[@muskrat645]

You state reduce by 10-15mm but your website under the table states 5-10mm. Which one is correct?

[@anotherneo231]

good work mate

[@Adrian1981]

What website did you use for the belt list?

[@gbaudio1212]

www.gbaudio.co.uk/data/belts.htm

[@gbaudio1212]

www.gbaudio.co.uk/data/belts.htm

[@tmp1k]

would one always need to subtract that 10-15mm? i'm looking to replace belt for a kenwood kd2055. platter diameter for belt is 220mm, multiplied by pi is approx 690. i've read that the belt size for this unit is 27.3 inch which is approx 693mm. cheers.

[@gbaudio1212]

Hi Mathieu, yes, the belt should be slightly shorter than the circumference of the platter hub. It should (just) grip on to the hub (not tight) when you replace the platter on the spindle. Then when you stretch the belt over the motor pulley, that gives it the correct drive tension so that it does not slip. Our best match for the KD2055 would be BELT45: gbaudioshop.co.uk/shop/index.php?rt=product/product&keyword=belt45&category_id=0&product_id=352

[@inthelandofmilkandhoney457]

Dude. Excellent👍👍👍

[@Dedicatedtolivinginthepast]

Does this same method work for finding the size of belt for a VCR? I have been working on a Magnavox from 1978 and I can't find the sizes for the belts or a belt kit for it anywhere online

[@gbaudio1212]

Similar, but slightly different. For VCR, tape, CDs and cassettes you should measure the drive path with string or thread and then deduct about 7% to allow for drive tension. That will give you a good approximation to the belt length.

[@Dedicatedtolivinginthepast]

@@gbaudio1212 Awesome! thanks for the help!

[@zulkefleesulaiman6711]

Thanks you

[@gbaudio1212]

See our table of drive belts for most turntables at www.gbaudio.co.uk/data/belts.htm

[@maddiejames5862]

I just got a new Sansui FR-D4 from my grandparents and I have no clue how to get it working! When I take off the platter and rubber mat, there is no tone arm belt in sight! I have no clue where to start :((((

[@pom5716]

It's a direct drive turntable, it doesn't have a belt 😉

[@TheGhostzZ]

where do i find the belt charts? would be cool if anyone could link it to me

[@gbaudio1212]

www.gbaudio.co.uk/data/belts.htm

[@KP-fg5ge]

Thanks a lot

[@breezebenitses397]

Hi cant seem to see belt size for jvc AL E1. 19.8 cm diameter. On the website. Can you suggest which one please. Thanks

[@gbaudio1212]

Hi, we don’t have any previous sales recorded for your model but, from your measurement, we would suggest our BELT36 (192mm dia. / 603mm circ. x 4.2mm wide) should be a good match. gbaudioshop.co.uk/product_info.php?products_id=358

[@lizzetteoliveras8861]

Could you let me know whats is the measure of a detrola turntable belt ?

[@alanfinlayson3274]

My old Matsui music centre (turntable/radio/double cassette) platter doesn't have easy access hole as it is solid. It's a real pain trying to hold the platter with one hand and try and loop it over the drive spindle which can't be seen under the platter!

[@gbaudio1212]

This is rare but some platters without access holes have a different system. Turn the platter upside down and look for a small hook or stud somewhere between the hub (where the belt sits) and the outside edge. Dress the belt onto the hub as normal, then hook it onto the hook/stud. Refit the platter with the hooked section of belt above the motor pulley. Now when you rotate the platter the belt should unhook itself and catch on the motor pulley. Good luck.

[@alanfinlayson3274]

@@gbaudio1212 Because I had a loose belt I actually cut out a piece and spliced the two ends together with duct tape. I managed to finally pull the belt far enough out to hook it over the drive spindle (earlier today before you replied) and it works fine except for a slight wobble when the repair runs across the spindle, but at least I can play my vinyl again. It might not last but I see you are in Brunswick Road. I am in Tollcross, and if my temporary repair fails can I bring the platter to get a new drive belt (correct size) if you stock these?

[@mimozasidiropoulou9916]

Thank you

[@gbaudio1212]

You're welcome. Happy to help.

[@saipierre5533]

Im looking for 209mm diameter with 4mm width.. For my nec p325e..and do you have any opinion what kind of cartridge i can use if im plan to use universal headshell.. I lost headshell and cartridge amd dont have any clue what kind of thing should I use..

[@gbaudio1212]

The closest matched belt we have is BELT435 which you can get from our online shop: gbaudioshop.co.uk/product_info.php?products_id=363 Yes the P325E uses a standard headshell so you have plenty of choice of headshell and any cartridge with 12.5mm (1/2") screw mounts. See our selection at: gbaudio.co.uk/data/cartridges.htm

[@gbaudio1212]

Also, check our headshell/cartridge setup tutorial which shows a similar headshell to your NEC P325E: kzbin.info/www/bejne/p2ewhIFqfMySmdU

[@saipierre5533]

@@gbaudio1212 thanks so much for the reply 😊

[@mimozasidiropoulou9916]

very nice video

[@gbaudio1212]

Thank you

[@ruitravanca9059]

Hi what you this turntable Techniks SD 22? Thanks

[@ruitravanca9059]

I Mean technics-sl-bd22

[@gbaudio1212]

@@ruitravanca9059 A tidy, entry level deck with a reasonable low-mass tonearm from mid-80s

[@sudhirsingh-sx8lo]

i used the calculation you provided and the belt i end up with was bigger.is the mm size when the belt is folded flat

[@gbaudio1212]

The diameter is the measurement straight across the centre of the drive hub or across the centre of the belt if were arranged in a perfect circle. If you fold the belt flat, ie doubled over, you get half the total length which is not the same thing. You could still work it out this alternative way: Fold the belt flat and measure it and then double it to get the total length or circumference. In this case, the old belt measured 328mm when folded flat, so x2 = 656mm. Then deduct 10 - 15mm to give the correct drive tension = 641 - 646mm.

[@apathyintheuk265]

It was going oh so plain and simple until 2:09 and then it tuned into an episode of the Open University.

[@gbaudio1212]

To be fair, I gave the simple 'piece of string' method as well as the mathematical calculation so you can follow which ever method of measurement you feel most comfortable with. Regards GB

[@bobbymalta73]

Thank you.

[@gbaudio1212]

You're welcome. Happy to help.

[@mohindersembi7647]

hi very interesting video you are professional engineer 😊can you please kindly help me on my sharp vz-3000 what size turntable platter belt I need please kindly help me on this. waiting for your kind reply sam

[@gbaudio1212]

Sorry, we don't have the VZ3000 on our database. Suggest you measure it, following the instructions at www.gbaudio.co.uk/data/belts.htm

[@sudhirsingh-sx8lo]

is final measurement folded flat?

[@gbaudio1212]

If you fold the belt flat, ie doubled over, you can measure it and then double it to get the total length or circumference. In this case, the old belt measured 328mm when folded flat, so x2 = 656mm. Then deduct 10 - 15mm to give the correct drive tension = 641 - 646mm.

[@robertoaldecoa244]

Missed showing rotation before and after.

[@cathyzook8525]

I wish things like this was also done in inches I know absolutely nothing about mm they didn't teach that when I went to school

[@gbaudio1212]

Hi Cathy, most tape measures and rulers have both metric and imperial measures on them. If not, here's a handy conversion site: goodcalculators.com/distance-converter/

[@jacobpolier2451]

You can also multiply what you measure in inches by 25.4. That will give you the equivalent in millimetres

[@davidheafield1436]

I think if you already understood the maths involved in measuring the diameter of the turntable then adding the width of a Romanian donkeys tail them subtracting the length of a tortoise’s neck then you don’t need this kind of demo. All joking aside it would be handy if you explained in dumb terms the extra maths involved after the measuring the diameter part of it , we didn’t all go on to higher education y’know.. Otherwise a pretty good video ...thank you

[@gbaudio1212]

Thanks for your feedback. As shown in the video (2 min, 12 seconds in), the calculation 3.14 (Pi) multiplied by Diameter gives you the total length (cirumference) of the hub. This simple formula works for all turntables. Or you can avoid the maths by using the string method if you prefer. Hope this helps make it clear.

[@davidheafield1436]

GB Audio , yes the string method is easy enough and I think most people could fathom that out themselves in desperation. I’m honestly not being argumentative for the the sake of argumentation , but I think you you live in a technicality-minded world that is blind to the average mans grasp of “Pi” , what is it and how you would apply it. In all my 57 years I’ve never been asked nor needed to apply a Pi solution to any common mathematical problem dealt to me in the real world. I’m by no means dumb neither would I regard myself as advanced educated but your average guy in the street that had no aptitude nor reason to retain knowledge of PI , advanced trigonometry etc since school 40+ years ago. Your video scores a 10/10 for production values , it’s very nicely done , but you need to take a step backwards and a look at yourself before you throw (unworked out) PI values into a common man solution ..... 2/10 “Johnny has obvious capabilities and is good in General Science , however he likes to show off in Maths” Mr.Chips , deputy headmaster.

[@ncspcrew2566]

really? I have only elementary school and every therm in this video is very obvious. I dont know how easier you can explain that. maybe some math video for 3 yo kids with elephants and penguins everywhere. for me much bigger problem is, that shops which sell those belts (at least in my country) dont mention lenght of belts which they offer in e-shops. but that is quite OT

[@Dunhill-gk3cs]

​@@davidheafield1436if you consider pi * D to be advanced maths then there's no doubt that you're an idiot. That's grade 8 maths mate. What a rude comment to this bloke who made a great video.

[@Poppinwheeeeellllllieeeeez]

good luck getting the speed anywhere 33.33 with those junky AC synchro's. no pitch control in sight. locking to line frequency does not make for a steady table. i junk everyone I encounter to prevent others from attempting to use them.

[@theerrantwanderer]

I know this is an old comment but the turntable featured in the video uses a DC motor. Pitch control is through two holes at the bottom of the turntable. It is inconvenient but better than nothing. You may have been thinking of older 1970s-80s belt driven turntables, which do use an AC synchronous motor and simply change the position of the belt to change speeds. Modern Pro-ject turntables also happen to use this type of motor, requiring you to manually change the position of the belt to change speeds

[@yambo59]

None of this rigamarole is even necessary, just go online and find the belt and manufacturers belt info for your particular model turntable,

[@mrshoning]

that's not an option for many vintage turntables

[@booncha1971]

Ya..I have a few obscure turntables I can't find much info on...this is simple math ...with a calculator 😊

[@gbaudio1212]

You may be lucky and get the right size but I find some inconsistency from different online suppliers. Best to measure it to be sure.

[@Dongfloppy]

Try that with vintage turntables, almost impossible to find the manufacturers let alone the belt

[@magat1614]

@@Dongfloppyso true I have a luxman pd-210 and I can’t find much to any information the unit it self so belt size is completely off the table

[@GroovingMarkor]

Thank you