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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 14th Nov 2019, 11:29 pm   #1
Piccy2valve
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Default Capacitors and speaker cloth

As i start to prepare for my first big project restoring my Mullard MAS61 , i need to stock up on capacitors , and also find a source of speaker cloth.

So my questions are .
1 where do forum members get their capacitors from, looking online there are some for sale on ebay but am unsure about their quality , RS sell them but seem expensive , i also see justradio.com sell them , are their kits good value or am i better just buying select values.

2. Where can i obtain speaker cloth, the fitted one is in a poor state with tears and staining.

I will start dissembling this weekend and carry out some cold checks and cleaning.

Regards mark
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Old 15th Nov 2019, 12:00 am   #2
60 oldjohn
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Default Re: Capacitors and speaker cloth

Hi Mark, Can we have a photo of the set as I am not familiar with that model, it may be made for the Irish market. I supply cloth suitable for the mid to late 1940s Philips sets I presume this may be the style you have.


John.
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Old 15th Nov 2019, 12:07 am   #3
Piccy2valve
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Default Re: Capacitors and speaker cloth

Hi john,
It was identified as a phillips model by forum members as i could not find any info on it.
https://www.vintage-radio.net/forum/...d.php?t=161344

I am also looking for cloth suitable for a phillips 170A as well

Pic attached below

Regards Mark
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Old 15th Nov 2019, 12:56 am   #4
ThePillenwerfer
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Default Re: Capacitors and speaker cloth

I've never had a problem with e-Bay/AliExpress capacitors, though I could have simply been lucky.
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Old 15th Nov 2019, 2:30 am   #5
Uncle Bulgaria
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Default Re: Capacitors and speaker cloth

I get most things from RS because they end up paying me to post it, and the Parcelforce man manages to communicate entirely in grunts. Anthropologically fascinating every time I get some capacitors.

Otherwise, CPC/Farnell if I want fewer than the minimum number RS work in, or something more peculiar. For more specifically valve things, or parts that don't look so out of place in old equipment, I go to Bluebell Audio in Dundee (currently strangely quiet) or Watford Valves or Cricklewood Electronics.

eBay has held no troubles for me, but I prefer buying from obviously smaller vendors rather than the Asian conglomerates as I like the personal touch so filter accordingly. Perhaps not so handy for capacitors, although some interesting Soviet things pop up a lot and make a change.

Speaker cloth I've used Liberty print cotton for my own 'speakers, but have bought wonderful cloth from Ben Dijkman (forum member too). It's not cheap, but it's the real deal.

I'm sure I also came across someone who wove wonderful cloths for old radios to order, so original patterns and specials could be done easily. Perhaps someone else recalls who that was...
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Old 15th Nov 2019, 2:55 am   #6
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Default Re: Capacitors and speaker cloth

The speaker cloth is usually a compromise, finding the original cloth for a given set is almost impossible. I have a fair collection of fabrics that are quite good replacements for original cloths that are completely beyond hope.
I'm afraid I have nothing that would suit your set, mine tend to be more gold/brown in colour.
A good place to look are market stalls that sell linen and fabric on rolls, whenever I'm out and about I'm always on the lookout and occasionally see something with potential.
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Old 15th Nov 2019, 7:17 am   #7
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Default Re: Capacitors and speaker cloth

Ebay caps/components tend to be more expensive than if you got them from Farnell, CPC, RS, Digikey or Mouser. You have to spend £20 at Farnell and Digikey (prices without VAT) to get free postage, £30 at Mouser. Delivery is fast from Digi and Mouser. RS are cr*p, I'm sorry but they are, they have very little choice or stock.

There is also Cricklewood, Rapid and a few others, but the big 3 are the cheapest and have the widest range of components.

Andy.
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Old 15th Nov 2019, 11:01 am   #8
David G4EBT
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Default Re: Capacitors and speaker cloth

As to whether it's a good idea to buy kits, I'd say no, because you'll have values that you'll never use, and other values that you'll run out of. You're better off when you need particular values, to buy a few more than you want (say a pack of ten), then over time you'll build up a stock of the more commonly used values. If you use UK suppliers, whether on ebay or not, it only takes a couple of days for items to arrive.

For 630V axial polyester/polypropylene (yellow) caps, which are commonly used as replacements for waxy paper capacitors, they’re widely available from many suppliers. I have accounts with CPC/Farnell, RS, Rapid Electronics, but but for some time now, I’ve used ‘Dunkselectronics’ – a UK supplier who has been on ebay since 2004, has excellent feedback from more than 23,000 sales.

https://www.ebay.co.uk/str/dunkselec...p2047675.l2563

Here's a clip from the description of the caps:

Quote:

Polypropylene Axial Metal Film 630V rated.

These look similar to the polyester ones from China but they are a better specification being made of the more desirable, more stable polypropylene material. They are well finished with epoxy end caps and good quality wire.

End quote.

ESR Electronics are great to deal with. They have a nice online catalogue and are one of the few firms that I ring to place an order as they answer the phone right away and I find it quicker than ordering online:

https://www.esr.co.uk/components/

Cricklewood electronics are a highly regarded firm who have been around for Decades and continue to serve us well.

They’re happy with small orders and can supply resistors, capacitors the most common of which we tend to use in restoration are 630V axial lead polyester film, high voltage electrolytics and high voltage ‘can’ electrolytic reservoir/smoothing capacitors.

They have a website but I find their ‘ebay shop’ easier to use as it shows the items most relevant to us:

https://www.ebay.co.uk/str/cricklewoodelectronics

For potentiometers (switched and unswitched) with linear and log tracks, I tend to use Bowood Electronics – a man and wife team. They sell a limited range of other items.

https://www.bowood-electronics.co.uk/

As well as capacitors, you'll find that you need replacement resistors. Many of the resistors in old radios will be 1/2 Watt and 1 Watt. Modern replacements of that Wattage are puny in size and look a bit out of place, so I tend to use modern 1 or 2 Watt metal film or carbon film ones which look more in keeping.

A lot of old radios will have crumbling rubber insulated wire which needs replacing, and for that, I use silicon rubber flex which strips easily and is heatproof. Forum member Phil Marrison, forum name 'SWB 18' can supply that by the Metre n about a dozen 'vintage' colours which look much more in keeping that modern PVC flex, which tends to look a bit gaudy. Phil visits the forum regularly so will answer a PM.

Though not directly relevant to your original query, the following comments may not be out of place.

Unusually, the service data of your set - Mullard 'MAS61' - isn't listed on the Vintage Radio Service Data DVD ROM, but you'll no doubt know that at least one capacitor will be in the 'must replace' category, namely, the audio coupling capacitor to the output valve.

There are two schools of thought on whether or not to 'blanket replace' waxy paper, pitch or mouldseal capacitors on sight, as to do so, isn't based on a proper diagnosis of the condition of the capacitor. However, to test a capacitor for leakage must be done at the rated voltage using an insulation tester, (not simply a multi-meter) and it's capacitance on a capacitance meter. That means lifting one end of the said capacitor to do the test. And lets suppose it passes, but others in the set don't pass the test? Would you be happy to leave it in place? I wouldn't, and it takes longer to do the test than it would to replace the capacitor.

It's my guess that from its model number, your set is pre-war so eighty or more years old. It may have some silver mica capacitors in the tuned stages, which with luck, should be fine and are best not disturbed, but personally, I'd think twice about leaving any waxy paper or pitch capacitors in place. Others may not concur with that view.

Hope that helps a bit.

Good luck with the restoration.
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Old 15th Nov 2019, 11:04 am   #9
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Default Re: Capacitors and speaker cloth

Hi Mark, worth thinking about joining the British Vintage Wireless Society. You get a fab quarterly magazine with high quality photos and articles, and access to the most popular values of new Poly film and electrolytic caps at sensible prices by mail order:. https://www.bvws.org.uk/ Well worth a look. Cheers, Jerry
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Old 15th Nov 2019, 11:30 am   #10
60 oldjohn
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Default Re: Capacitors and speaker cloth

Hi Mark, I don't have cloth same as in your picture. If you need the exact match for the Mullard cloth I would suggest trying Corrien Mass in Holland http://www.corrienmaas.nl/ not cheep and quite a long waiting list, but she can make most patterns given a bit of the original material. I can supply a piece 10.5 x 16inches as pictured for £3.50 + postage, this is very similar to the material used in many Philips sets from 1946, 47 48 and 49. I have just added another photo, I hate out of focus photos.


John.
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Old 15th Nov 2019, 2:59 pm   #11
John10b
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Default Re: Capacitors and speaker cloth

Try Russel Chaplin at Retrospecialist, tel. 01206394195, or look on their website for speaker cloth.
Cheers
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Old 15th Nov 2019, 9:56 pm   #12
Piccy2valve
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Default Re: Capacitors and speaker cloth

David G4EBT,
Thank you for your extensive and informative post, very welcome.

Re the set itself it was identified as being a phillips chassis model B6IF72A from 1958 / 59

Your thoughts on the kit backs up what i was thinking , but not knowings which ones i would encounter the most have decided just to order some based on the schematic and some from the suggestions in this post.

Regards mark
EI6HWB /M0EUA

Last edited by Piccy2valve; 15th Nov 2019 at 10:14 pm.
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Old 15th Nov 2019, 10:02 pm   #13
Piccy2valve
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Default Re: Capacitors and speaker cloth

A big thank to everyone who has added to this post , i am going to research my way through all options -before buying the capacitors it will be based on ease of getting them to ireland and quality in preference to the cheapest.
I am taken back by the friendliness and support offered by this forum , hopefully my working knowledge will one day be on a par with my modern electronics knowledge .

I will look into becoming a Bvws member also

I cant wait to get started on my MAS61 but i know a little prep work will save hours later on.

Otherthings on my list are buy thr service data dvd , and some bakelite cleaning paste

Last edited by Piccy2valve; 15th Nov 2019 at 10:13 pm.
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Old 15th Nov 2019, 10:12 pm   #14
Uncle Bulgaria
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Default Re: Capacitors and speaker cloth

Addendum to my previous post - if you haven't any valve-suitable capacitors (high voltage etc.) then I have read very good things about the quality and service provided by Just Radios. They are in the US, but I understand a number of people here and on other fora from Europe have bought capacitor and resistor kits (unusual values too for particularly aged sets) with free postage.

Probably worth a look if you want to stock up...

https://www.justradios.com/capkits.html
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