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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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3rd Jun 2020, 11:16 am | #1 |
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Indentifying a VHF tuner - Clarke and Smith 88/10
Hi all
there have been a small number of threads on the above subject over the years and I had thought I'd seen most of them until I recently starting restoring a clarke and smith 88/10 FM schools set which dates from the mid 1950s. Its an early one in fact their first FM model, and it is fitted with one of these tuners of the type shown in the picture. (they used at least 2 other front ends in later 88 series of schools receiver). So my first thoughts were Philips ( the ad in fact suggests a major maker) but I have not been able to find anything closly resembling anything of theirs, so can anyone help or better still supply a circuit, or some clear photos of one both sides of the unit, as mine has been got at and while the set is presently working perfectly on AM now, FM is as dead as a dodo. The tuner is actually dated Nov 1954. Oh and it is not the ECC85 ! Thanks in advance for any help Kind regards Terry
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3rd Jun 2020, 11:30 am | #2 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
The IF transformer definitely has a Philips look to it, ECC81 perhaps?
http://www.r-type.org/exhib/aai0246.htm
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Frank |
3rd Jun 2020, 11:32 am | #3 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
That picture looks very familiar - did the Jasonkit FM tuners use them?
Andy |
3rd Jun 2020, 1:35 pm | #4 | |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Quote:
ECC81 Not the ECC85 as in that's not the problem rather than not an ECC85?
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3rd Jun 2020, 2:07 pm | #5 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Hi definetely an ECC85 according to the ad and there is one in the Clarke and smith tuner as a later service replacement by the look of it as it has Mullards yellow print on the glass envolope. Tried a couple of new ones in it as well.
Regards Terry
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3rd Jun 2020, 5:46 pm | #6 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Just out of interest I tried an ECC81, no good so I'll stick with the ECC85.
Hoping there is a circuit out there, perhaps other setmakers used the same tuner unit in thier radio sets at the time so here's hoping . Regards Terry
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3rd Jun 2020, 5:52 pm | #7 |
Octode
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
The heater connections differ for the two valve types. Pin 9 is a heater centre tap for the '81 and a screen for the '85. If you use an ECC81 and the heater supply is connected to pins 4 and 5 only, the valve requires a 12.6 V supply. The '85 is far more commonly found in FM tuner heads.
Leon. |
3rd Jun 2020, 7:05 pm | #8 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
The advert clearly states it’s an ECC85. Don’t waste time trying anything else.
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3rd Jun 2020, 7:29 pm | #9 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Yes an ECC85 is the correct valve, that I know , the ECC81 was never going to work but wanted to cover all tests
Thanks for everyones obsevations, just need a circuit now Regards Terry
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3rd Jun 2020, 8:47 pm | #10 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
This post suggests that the 88/10 was AM only, could this be an 88/12?
https://vintage-radio.net/forum/show...4&postcount=11 In which case there may be a schematic here: http://portabletubes.co.uk/boats/clarke.htm |
3rd Jun 2020, 8:53 pm | #11 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Hi Bill
It is a model 88/10 an earlier version normally AM only but this one is FM as well, a rarer version. I have the dyeline drawings for the 88/12 which appeared some what later and is a differant beast. Regards Terry
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3rd Jun 2020, 9:05 pm | #12 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Apologies for ECC81, put it down to hot weather and the lock down.
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3rd Jun 2020, 11:43 pm | #13 |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
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5th Jun 2020, 9:24 am | #14 | |
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Re: Indentifying a VHF tuner - Clarke and Smith 88/10
Perhaps that FM front end was a Dormer & Wadsworth (D&W) model?
In the Dormer & Wadsworth thread, https://www.vintage-radio.net/forum/...d.php?t=157235, it was established that: 1. Clarke and Smith did use D&W FM front ends in some models (post #5); and: 2. Haverson Surplus was involved with what appears to be a surplus sale of D&W FM front ends (post #16) Quote:
Cheers, |
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