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Old 11th Jan 2018, 3:07 pm   #1
MALC SCOTT
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Default Regentone BT17 Driver transformer.

Hi, anyone got a spare output t/x for this transistor radio? Cheers, Malc.
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Old 11th Jan 2018, 4:16 pm   #2
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Default Re: Regentone BT17 output transformer.

Haven't got the exact one Malc but may have something suitable. What are it's specs/physical size? I have a couple of RS midget/minature OPT's if of any use., and several matching tfmr's.

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Old 11th Jan 2018, 4:27 pm   #3
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Default Re: Regentone BT17 output transformer.

The Regentone BT17 doesn't have an output transformer Malc - it does have an audio driver transformer. Have you given use the right model number?
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Old 11th Jan 2018, 4:53 pm   #4
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Default Re: Regentone BT17 output transformer.

Sorry, I should have said driver transformer.
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Old 12th Jan 2018, 10:30 am   #5
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Default Re: Regentone BT17 Driver transformer.

As I said Malc, I have several NOS RS minature tfmr's that should do the job. I'll see if I can find the turn's/Z ratio; any idea of yours?

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Old 12th Jan 2018, 10:48 am   #6
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Default Re: Regentone BT17 Driver transformer.

Hi Andy, the cct diag states the primary winding is 200 ohms and both of the secondarys are 43 ohms. Hope this info helps, Malc.
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Old 12th Jan 2018, 4:33 pm   #7
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Default Re: Regentone BT17 Driver transformer.

Hi Malc, the one i found is a RS driver tfmr 1:1 ratio. Measured windings are 68 and 80 ish ohm's DC res. Pri is two terminal, sec is centre tapped, (yours from schematic is two separate windings) but one leg read OC. Size of this and other similar tfmr's I have is 3/4 X 5/8 x 5/8" approx. I'll have another look tomorrow and see what else there is.

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Old 12th Jan 2018, 5:52 pm   #8
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Default Re: Regentone BT17 Driver transformer.

Hi Malc, yours is probably a 3to 1+1, or 4 to 1+1

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Old 13th Jan 2018, 6:56 am   #9
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Default Re: Regentone BT17 Driver transformer.

Thanks Ed, gives me a better idea what to look for.

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Old 13th Jan 2018, 1:58 pm   #10
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Default Re: Regentone BT17 Driver transformer.

Gone through them all Malc and can't find one that'll suit, sorry.

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Old 13th Jan 2018, 3:59 pm   #11
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Default Re: Regentone BT17 Driver transformer.

Thanks for looking Andy.
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Old 20th Jan 2018, 12:43 pm   #12
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Default Re: Regentone BT17 Driver transformer.

Still looking for one, Malc.
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Old 21st Jan 2018, 7:33 am   #13
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Default Re: Regentone BT17 Driver transformer.

Hammond do a good range of tfmr's Malc - https://www.hammfg.com/electronics/transformers/audio

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Old 22nd Jan 2018, 9:16 pm   #14
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Default Re: Regentone BT17 Driver transformer.

I've just been looking at audio transformers at RS and they do some small interstage types. The part number is 210-6368, but this is for an E187A. If you look at the associated table there is a type E187B which looks like it may have two seperate secondary windings. Might be worth a look at as they are small enough in size. Not cheap though.
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