|
|
|
|
|||||||
| Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
 |
|
|
Thread Tools |
10th Mar 2019, 9:18 am
|
#1 |
|
Heptode
Join Date: Jan 2007
Location: Parkes, NSW Australia
Posts: 877
|
Philips 387U component
I have a Philips radio from the mid 1940s with an unusual component in it. It is a relay I think. Associated with the filament circuit. When the radio is cold the contact is closed, but opens after the radio warms up. If you close the contact, the dial lamp goes out. Is this some kind of soft start device? I attach a pic of the relay and part of a circuit of a similar radio, I don't have a circuit diagram for the 387U.
|
|
|
10th Mar 2019, 10:00 am
|
#2 |
|
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
|
Re: Philips 387U component
Well its a relay alright.
Never seen that set, Aussie model? Without the full diagram I guess same as you that it controls something as it warms up. Philips did like to complicate things! The usual knowalls will be along soon to help, bless them, what would we do without them? |
|
|
|
10th Mar 2019, 10:35 am
|
#3 |
|
Rest in Peace
Join Date: Apr 2011
Location: Matlock, Derbyshire, UK.
Posts: 1,378
|
Re: Philips 387U component
Fast warm up?
|
|
|
|
10th Mar 2019, 10:42 am
|
#4 | |
|
Heptode
Join Date: Jan 2007
Location: Parkes, NSW Australia
Posts: 877
|
Re: Philips 387U component
Quote:
|
|
|
|
|
10th Mar 2019, 10:51 am
|
#5 |
|
Guest
Posts: n/a
|
Re: Philips 387U component
Pilot lamp saver?
|
|
10th Mar 2019, 11:13 am
|
#6 | ||
|
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
|
Re: Philips 387U component
Quote:
|
||
|
|
|
10th Mar 2019, 12:01 pm
|
#7 |
|
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
|
Re: Philips 387U component
I'd go with MM. Cold heaters in series with pilot lights usually means dim pilots are the result of the usual resistor/thermistor protection schemes. Looks like an engineer's rather than bean counter's approach to the problem.
It's Philips, too- why use one cheap component when several plus a relatively expensive relay will do?
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
|
|
|
10th Mar 2019, 1:04 pm
|
#8 |
|
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Philips 387U component
In this one the relay coil supplies the bias for the valves via some taps:
http://www.philipsradios.nl/Schemas/657U.pdf Lawrence. Last edited by ms660; 10th Mar 2019 at 1:33 pm. Reason: addition |
|
|
|
11th Mar 2019, 12:09 pm
|
#9 |
|
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
|
Re: Philips 387U component
Either for faster warmup, protection of the lamps or both.
|
|
|
