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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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12th Apr 2018, 10:45 pm | #1 |
Heptode
Join Date: Jul 2012
Location: Derby DE1, Derbyshire, UK.
Posts: 626
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Change Philips black pitch capacitors to Mullard mustards?
Hi, I just wondered what others thought? In some of my restorations like my Philips Disc Jockey Major record players, I've replaced the original Philips black pitch capacitors where possible with C296 Mullard mustard types.
I say where possible, because I've struggled to find a Mullard mustard of a voltage any higher than 1,000 volts. So where it is possible, is the Mullard mustard a reasonable choice for replacing the original black pitch types? Thanks, Paul. |
13th Apr 2018, 9:24 am | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
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Re: Change Philips black pitch capacitors to Mullard mustards?
Mullard mustard capacitors have a good reputation and are priced accordingly. I doubt they're electrically any better than modern polypropylene and similar types of cap though.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
13th Apr 2018, 9:35 am | #3 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,622
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Re: Change Philips black pitch capacitors to Mullard mustards?
Philips/Mullard C296 series Polyester dielectric capacitors are a very reliable component and they look more "period" than the usual bright yellow modern types, when fitted as replacement parts in vintage equipment. However, to buy them now is an expensive business, as sellers have latched on to their popularity for use in vintage equipment restorations!
As fas as I know, the C296 series was only available with a maximum voltage rating of 400Vdc. I'm fortunate in having salvaged many C296 capacitors from equipment that I've scrapped over several decades. Philips/Mullard ceased production of these components in the early-mid 1980s. |
13th Apr 2018, 10:11 am | #4 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,767
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Re: Change Philips black pitch capacitors to Mullard mustards?
If only I had known when back in the day we scrapped loads of Philips sets 9170 springs to mind .Mick.
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13th Apr 2018, 9:20 pm | #5 |
Heptode
Join Date: Jul 2012
Location: Derby DE1, Derbyshire, UK.
Posts: 626
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Re: Change Philips black pitch capacitors to Mullard mustards?
Thanks graham, thanks dazzlevision, yes that's right i've only ever seen them in 160 volts and 400 volts, so it's a bit of an impossible task to try and do a blanket replacement if required.
I was trying to keep the period apearence, and i knew the philips mullard mustards very rarely faild, or driftered even after a good baking from valves close by. Paul. |
14th Apr 2018, 8:07 pm | #6 | |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Change Philips black pitch capacitors to Mullard mustards?
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14th Apr 2018, 8:33 pm | #7 |
Rest in Peace
Join Date: Apr 2008
Location: London, UK.
Posts: 2,508
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Re: Change Philips black pitch capacitors to Mullard mustards?
Maarten mentions a few places where the high voltage or dV/dt rating of the paper caps may have been required, such as isolation caps. However, in something like a record player or other low power domestic audio equipment, such circuit positions are few and far between; a 400V Mustard will do pretty much everything else regardless of the voltage rating of the original paper cap. One more exception I can think of would include across output and bias oscillator transformers.
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15th Apr 2018, 8:16 pm | #8 |
Heptode
Join Date: Jul 2012
Location: Derby DE1, Derbyshire, UK.
Posts: 626
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Re: Change Philips black pitch capacitors to Mullard mustards?
Thank you maarten for your input, thanks lucien, yes the tone correction capacitor rated at 4.7nF 4,700pF accross the sound output transformer, must be rated at 1,000 volts, so i use a more modern type for this like the yellow film capacitors.
Paul. |