Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

High voltage readings
#16

Rod

Reactance does not affect DC level.
It affects the AC component, but the average value of the voltage will get through.
So while the additional active resistance will drop additional volts, it is not an equivale to what reactance does: the reactance strictly help with filtering out the AC component.



Tom,

Also, I kept reminding myself to tell you, you could reduce the 1st cap within reason, between 6-8uF, and you could then increase the second cap quite a bit to compensate, it could go to 20uF or 40uF. The direct capacitance the tube sees is mostly the first cap, and so this does not violate tube's recommended maximum capacitive load.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
#17

RodB

Thanks, I'll keep that in mind if changing the capacitor value doesn't get the voltage down far enough. It would be nice to get the plate voltages down far enough so that the 124 volt line voltage won't bump those voltages back above 250 volts once this radio is off the variac. I'm hoping not to have to add any more parts that weren't in the design of this radio.

Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.




Users browsing this thread:
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Today I've been reading through the site trying to learn more about this radio. I also soldered the lose power cord cabl...osanders0311 — 08:24 PM
Philco 610B oscillator wiring
Thanks David! I do have that same later prodution model 610 schematic. I've also studied the Philco service bulletins fo...Tubester — 08:12 PM
Philco 610B oscillator wiring
Some info from Beitmans says late production. David   David — 06:06 PM
Restoring Philco 96
Oh wow! Just found this thread.  Brings me back to early days on this phorum.  I did a 96 back in 2017.  Thread here: ...rfeenstra — 06:05 PM
Philco 610B oscillator wiring
Thanks for the replies. It's not the really the hum that I am after. Just trying to understand why only the shortwave ba...Tubester — 04:01 PM
Restoring Philco 96
70 and 90 are Superhets, but at least the 2x45 model of 90 uses the Plate detector (and so does 70). Also the Atwaters,...morzh — 03:28 PM
Restoring Philco 96
Morzh, Prayers for your mom. I am sure that there was enough pain living through the Holocaust as a child. I pray dail...MrFixr55 — 02:19 PM
Philco 610B oscillator wiring
Hi Dan, Divide and conquer. First off trry to differentiate between 60Hz and 120 Hz hum. 120 Hz hum has a higher pit...MrFixr55 — 01:49 PM
Restoring Philco 96
Yes, other than takin a toll on your back, they are undeed way more repair friendly than many other Philcos. To me, som...morzh — 01:04 PM
Philco 610B oscillator wiring
If the wires look like they were this way from the factory (very neat and very dull soldering joints), I'd leave them be...morzh — 12:58 PM

[-]
Who's Online
There are currently no members online.

>