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| Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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3rd Jul 2008, 3:00 pm
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#1 |
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Retired Dormant Member
Join Date: Jun 2006
Posts: 1,798
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Dynatron comms receiver
I had to give the insides a dusting and polish the valves so took a few pics of it, not many of these around. Made in the early fifties by Marconi Marine for Dynatron. Valve line up has several W77 Z77 D77. The audio stage has Z77 6V6G a 5Z4G Rec and KT66 shunt stabiliser. The DIN socket for the gram input is something I added, along with a few mains suppresser components and a replacement TCC 2uF capacitor when I put in a faulty rectifier valve and shorted the original.
Geof Last edited by geofy; 3rd Jul 2008 at 3:06 pm. |
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3rd Jul 2008, 9:03 pm
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#2 |
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Dekatron
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,817
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Re: Dynatron comms receiver
This is interesting. I saw a Dynatron RG in auction at Battle last year but didn't pursue it! Later I saw this [probaly identical] radio unit in a stand alone
domestic unit and realised my instincts had been right! I didn't know that Dynatron did any comms rx's though. Do you have an history on this set? Thanks for posting. Dave W |
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3rd Jul 2008, 10:28 pm
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#3 | |
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Retired Dormant Member
Join Date: Jun 2006
Posts: 1,798
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Re: Dynatron comms receiver
Quote:
The history of this set is a few of them in various states were returned to the Marconi Marine Company, Electra House, Chelmsford (Now Vindus Volkswagen, is nothing sacred, though it keeps the building in good order) to be scrapped, and an uncle worked there and bought this one, probably on a shilling scrap note. But he had not thought of his wife's reaction to bringing a hundred weight of radio home, you're not having that thing in the house  So I ended up with a surprise Christmas present a few years ago  It is interesting that you saw one not so far away, it is quite likely that a Marconi employee bought this, there were six in all, and fitted it into a more domestic cabinet. The short-wave AM goes from 10 to 80 metres and it has MW, LW also a gram input, and an audio amp to rival any good quality hi-fi valve amplifier, it was originally a 50 Ohm output but there is also a 15 Ohm tapping. It has given reliable service since I have owned it, even after I did a daft thing and fitted a dud rec valve as an experiment, needless to say that valve met with a sticky end  the whole thing uses 100W and has an HT standby switch. You should have got hold of the one you saw!Geof |
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3rd Jul 2008, 11:30 pm
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#4 |
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Dekatron
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,518
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Re: Dynatron comms receiver
Well, I have a Tuner exactly the same here!
I look forward to getting the amp made! A cracking set though! Sean
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Engineers make things work and have spare bits when finished |
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4th Jul 2008, 9:01 am
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#5 | |
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Retired Dormant Member
Join Date: Jun 2006
Posts: 1,798
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Re: Dynatron comms receiver
Quote:
Have you the model T99B tuner, where did this one come from. They are certainly made with money being no object. It could be connected to any amplifier, as long as it gets an HT and LT supply of course. I have not been able to get any technical information on the units though. I have quite a few spare valves for the set, the only unusual ones in the tuner are a Mazda X79 which appears to be an oscillator and in the gram input 6BR7 and the tuning indicator Y61. Can you post a picture of your unit? Geof |
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