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Old 10th Aug 2007, 6:16 pm   #1
howard
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Default Defiant transistor radio - model ? battery ?

Hello,

I have almost finished restoring the case on an old Defiant transistor set (see pic) but can't progress further without service data and its power requirement.

Does anyone recognise this Defiant set ? It's quite an early set as its complement of transistors is OC44, 2x OC45, OC81D and 2x OC81.

Also, it has a battery clip (see pic) that I've not encountered before with 4 pins, does anyone know what battery once fitted this ?

Thanks,

Howard
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Old 10th Aug 2007, 6:43 pm   #2
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Default Re: Defiant transistor radio - model ? battery ?

Hi Howard
looks like an A55 - later version (not sure what the earlier version was!) - it supposedly took 2 x 4.5volt batteries - but that doesn't seem right with your battery plug. I've got one of these somewhere (which I haven't played with yet) and I'm sure mine has been altered to take a 9 volt battery.
Paul has the trader sheet
Cheers
Andy
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Old 10th Aug 2007, 6:46 pm   #3
batterymaker1
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Default Re: Defiant transistor radio - model ? battery ?

A55 sounds right.

You need a PP11 to run it--it's a dual 4.5 volt battery.
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Old 10th Aug 2007, 10:32 pm   #4
AC/HL
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Default Re: Defiant transistor radio - model ? battery ?

PP11 sets have the speaker connected between the battery centre tap and the (otherwise normal) output stage centre point, thus saving a capacitor. When PP11s became obsolete the standard mod was to replace the connector with press studs for 0v and 9v & use a PP9, which is the same size. This powered the radio as before. The centre tap was disconnected & removed, and the speaker connected via a suitably polarised 100mFd capacitor to 0v or 9V. Note the term mod, not bodge, as such mods have been an essential part of everyday radio maintenance from the early days.
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Old 10th Aug 2007, 10:45 pm   #5
howard
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Default Re: Defiant transistor radio - model ? battery ?

Hello again,

Thanks all for identifying this set as a 1963 Defiant A55 and its PP11 2x 4.5v battery. I have now got a copy of Trader sheet 1607 for the set and as PP11 batteries are long gone I shall convert it for PP9 use as described by Bill.

It's come up really nice, and it's not unlike a Perdio Fanfare in construction and no doubt will soon appear in Success Stories.

Howard
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Old 10th Aug 2007, 10:46 pm   #6
ronbryan
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Default Re: Defiant transistor radio - model ? battery ?

Howard

Can you post a picture of the circuit board? From the layout of the controls, tuning scale and wavechange switch it looks as if internally it might be the same as my Contessa Mk 111 kit radio.

Ron
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Old 10th Aug 2007, 10:51 pm   #7
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Default Re: Defiant transistor radio - model ? battery ?

That sounds very likely - an earlier Defiant here (A5, I think) is much the same as an earlier Contessa I have.

Paul
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Old 10th Aug 2007, 11:05 pm   #8
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Default Re: Defiant transistor radio - model ? battery ?

Hello Ron,

Here's the inside of the Defiant.

Howard
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Old 10th Aug 2007, 11:16 pm   #9
ronbryan
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Default Re: Defiant transistor radio - model ? battery ?

Howard / Paul

Yes, the internals are the same as the Contessa Mk III. The only differences are that my Contessa did not have an earphone socket and that piece of cardboard attached to the right-hand end of the ferrite rod was missing.

I wonder if surplus stock was sold off by Defiant when production ceased and Henry's Radio and Electrovalue bought it all up and incorporated it in a new case.

Ron

Ron

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Old 11th Aug 2007, 9:52 am   #10
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Default Re: Defiant transistor radio - model ? battery ?

I think it's a Plessey design that was sold to pretty much whoever wanted to market it in any form, with kit sets being released not far behind those from recognised brands. This one's a Magnavox 300TR table model, probably a little earlier in view of the Ediswan transistors, and no doubt with a few component changes at least to allow for the six volt 996 batteries that the bigger cabinet lets it use. As I recall the earlier Defiant and Contessa models use a very similar board again, though with different presentation (oversized round perspex tuning control in TR82 fashion): and there's an Alba clone of those around too....

Paul
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