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Old 28th Oct 2007, 4:28 am   #1
philcophil
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Default uy85 to diode conversion

i'm not at all familiar with this radio,my 1st foreign set,made in holland. can someone tell me how to use a diode here? uy85/38a3 tubes are not at all common here. thanks,phil
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Old 28th Oct 2007, 11:22 am   #2
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Default Re: uy85 to diode conversion

UY85 data: http://tdsl.duncanamps.com/link.php?target=002597CA

The heater is 38V 0.1A so should be replaced with a 390 ohm resistor. Unless the heater is open circuit, you should leave the old tube in place.

Replace tbe plate / cathode connections with a 1N4007 and 200 ohm surge limiting resistor in series.

Paul
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Old 28th Oct 2007, 2:04 pm   #3
Paul Stenning
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Default Re: uy85 to diode conversion

UY85 valves are still readily available here as they were used in loads of sets, so rather than modifying you could post a request in the Wanted section for a good used one.
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Old 28th Oct 2007, 3:48 pm   #4
philcophil
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Default Re: uy85 to diode conversion

thanks to both pauls. i think the price of tube plus shipping to here is probably more than this radio is worth,i just want to see if the rest of the radio is o.k. before investing much money in it. the diode mod is easily reversable once i find a tube,thank you very much for the info,do you have a schematic by any chance?
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Old 28th Oct 2007, 4:36 pm   #5
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Default Re: uy85 to diode conversion

I would not recomend this mod,as Paul says UY85's are readily available,and using this gives the set a gradual build up of HT to the correct level.The HT with the solid state diode would be excessive,while the valves are heating up!
This can shorten their life.
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Old 28th Oct 2007, 4:51 pm   #6
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Default Re: uy85 to diode conversion

Quote:
Originally Posted by philcophil View Post
.....do you have a schematic by any chance?
You haven't told us the make or model number of the radio!

Click the banner in the top right corner and see if it's available from me, first.
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Old 28th Oct 2007, 5:00 pm   #7
paulsherwin
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Default Re: uy85 to diode conversion

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Originally Posted by Paul Stenning View Post
You haven't told us the make or model number of the radio!

Click the banner in the top right corner and see if it's available from me, first.
Phil gave the model number in his thread requesting service info. It's a B1X code so wasn't made in Britain or for the UK market. Paul doesn't have service info for it.

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Old 28th Oct 2007, 5:52 pm   #8
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Default Re: uy85 to diode conversion

This must be similar to a common radio. The nearest I can find is a B1X01A on a Dutch site but it is an AM-FM set. If you can supply the valve (tube) lineup maybe can do some more digging.





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Old 28th Oct 2007, 6:13 pm   #9
philcophil
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Default Re: uy85 to diode conversion

hi,the tube line-up is uy85,6da6,ef89,ecc85/6aq8,uabc80,and ul80.
thanks again for the assistance, phil
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Old 28th Oct 2007, 6:17 pm   #10
philcophil
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Default Re: uy85 to diode conversion

i forgot to mention it is am/fm ,phil
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Old 28th Oct 2007, 10:41 pm   #11
MALC SCOTT
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Default Re: uy85 to diode conversion

Quote:
Originally Posted by philcophil View Post
i'm not at all familiar with this radio,my 1st foreign set,made in holland. can someone tell me how to use a diode here? uy85/38a3 tubes are not at all common here. thanks,phil
Hi Phil, Radio Tube Supply, 23 Delaware ave, Poland, Ohio 44514 stock these new for $6.99. I have bought several valves from this company and find them very good. Cheers, Malc.
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Old 28th Oct 2007, 11:21 pm   #12
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Default Re: uy85 to diode conversion

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Originally Posted by philcophil View Post
i forgot to mention it is am/fm ,phil

In that case, try this site:

http://radiotechniek.cjb.net/radiotechniek.php

You will need to sign up (free) in order to download circuits (also free). He has a vast number of European circuits available.

You may well find that the B1X01A is very similar to yours.....same tube line-up anyway.


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Old 30th Oct 2007, 4:05 pm   #13
philcophil
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Default Re: uy85 to diode conversion

thnks for the schematic and parts link,when i get back to this radio i'll post results,phil
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