Just beautiful Marvels of engineering when it really was engineering!
Always on the look out for other electrical things to learn about. I've just purchased this old radio for an experiment and mess about with valves Cool shape i think to. Shall be tuning into some radio 4 shortly!!
This looks like a good starting pointAnyone know of any repositories with manuals for any of these beasts??
Most popular values have been remade, some are really sought after - like the Mullard GZ34 - this is used in a lot of music amps etc so commands a high price - a modern remake is about £30 - an original unused new old stock original (especially with yellow writing) can go for £100 or so - it's crazy but true. Anyhow, the good news is that your father's radio is unlikely to use anything so expensive, and most vales are commonly available, via ebay or specialist sellers, who do still exist. e.g. Watford Valves - www.watfordvalves.comDang you for sowing a seed...
My father had/has a homemade valve radio in his workshop (something he made as a kid), had as in it once worked, has as in its not worked for years since the local chemist ran out of stock of radio valves.
Im going to attempt to bring the thing back to life for him for Christmas.
Any suggestions on where to get valves from and is there a good list of alternative valve options as I guess some must be unobtainable now?
Please remember guys these radios have a potentially live Chassis as they were an AC/DC set. I have several I have done over the years. Please make sure the neutral is going to the Chassis when you connect the non polarised plug at the back of the radio.
Some stats on my replaced parts and how out of spec 70 ish year old parts get!
Original Part reading first, correct reading second
C22 - 122.8nF - 100nF
C19 - 25.7nF - 10nF
C18 - 32.5nF - 10nF
C17 - 9.3nF - 3nF
C15 - 27.23nF - 10nF
C16 - 122.0nF - 50nF
C9 - 183.4nF - 50nF
C10 - 85.51nF - 50nF
C1 - 143.04nF - 50nF
C5 - 136.6nF - 50nF
R16 - 252R - 250R
R15 - 11.66KR - 10KR
R18 - 247R - 250R
Notice how out of spec the caps get! This is in line with the way caps go in all electronics, so pinball is no exception