|
|
|
|
|||||||
| Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
 |
|
|
Thread Tools |
10th May 2022, 5:47 pm
|
#21 |
|
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Philco A3762
Measurements across resistor is 1.68v then ends at 1.9
|
|
|
10th May 2022, 6:13 pm
|
#22 |
|
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,327
|
Re: Philco A3762
That's not right surely?
__________________
Edward. |
|
|
|
10th May 2022, 6:19 pm
|
#23 |
|
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,639
|
Re: Philco A3762
To be honest I'm struggling to make sense of your readings.
Could you take the voltage readings (meter on DC setting) at the points indicated by the arrows and put them on the diagram? |
|
|
|
10th May 2022, 6:22 pm
|
#24 |
|
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Philco A3762
According to your earlier measurements, approx. 168 volts is being dropped between the reservoir capacitor and the anodes of the pentodes, that suggests high resistance somewhere.
EDIT: Post crossed. Lawrence. |
|
|
|
10th May 2022, 6:40 pm
|
#25 |
|
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,288
|
Re: Philco A3762
Either that or there's something wrong with the measuring technique!!
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
|
|
10th May 2022, 6:50 pm
|
#26 | |
|
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Philco A3762
Quote:
Lawrence. "The Lord helps those who help themselves" |
|
|
|
|
10th May 2022, 6:53 pm
|
#27 |
|
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,288
|
Re: Philco A3762
-740V on a control grid can't possibly be true!
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
|
|
|
10th May 2022, 7:14 pm
|
#28 |
|
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: Philco A3762
-740mV I could believe.
Lawrence. |
|
|
|
10th May 2022, 10:06 pm
|
#29 |
|
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Philco A3762
The multimeter I've got is a an8008 it doesn't show dc just auto it has ac true, I have now got a 180ohm gone bad so will have to change that first just ordered so don't want to put power on until changed
|
|
|
|
11th May 2022, 8:00 am
|
#30 |
|
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,288
|
Re: Philco A3762
Manual here:-
https://needful.co.ua/image/catalog/...AN8008-Eng.pdf The SELect button toggles between AC and DC.
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
|
|
|
14th May 2022, 8:37 pm
|
#31 |
|
Heptode
Join Date: Sep 2014
Location: St Albans, Hertfordshire, UK.
Posts: 594
|
Re: Philco A3762
Just to up date first thanks for the help I have replaced the resistor that I made smoke with my clumsy fingers. Gone back and had another look couldn't get the voltages right still strange. Changed the rectifier for what I said in post 1, now I have the correct voltages and sounds amazing now thanks everyone
|
|
|
