|
Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
|
Thread Tools |
10th Sep 2017, 12:19 pm | #21 |
Hexode
Join Date: Mar 2011
Location: Wilstead, Bedfordshire, UK.
Posts: 367
|
Re: Using a Lamp to get max brightness out of a tx
When I did my National Service I did 18 months in Aden working on T1509s there were approx. 10-12 maybe even more but I can remember that when we finished servicing one we would connect it up to a bank of tubular bulbs and leave it running for a while giving it a good soak test before it was put on air, it used to contribute to the heat in the transmitter hall quite a lot, there were also SWABs in the hall as well I think they were SWAB8s but not certain, I did not work on those, there were also some other transmitters but as I did not work on those I cannot remember them
|
10th Sep 2017, 12:45 pm | #22 |
Octode
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
|
Re: Using a Lamp to get max brightness out of a tx
Another use for a lamp is in a crystal controlled TX, a low power torch bulb in series with the crystal will give max' brilliance with max' crystal activity, from what I've read bulbs up to 80mA would be used with FT-243 size crystals, I have a crystal oscillator using a 6AG7 with a HC49 crystal in an 'electron coupled oscillator' mode ( don't ask me any questions about that, I'm not quite sure why it works but it does ) and this lights up a 6V 16mA 'grain of wheat bulb' to bright orange when tuned up.
John |
14th Sep 2017, 8:01 am | #23 | |
Heptode
Join Date: Jul 2009
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 723
|
Re: Using a Lamp to get max brightness out of a tx
Quote:
Anyone care to suggest what the three connections were for? (E E1 & KEY COM?) Cheers James |
|