05-05-2017, 09:02 AM
tore out the band selector switch again to access a resistor that needed replaced.
working on a way to make these hidden parts more accessable in the future without lengthening the leads... seems impossible.
Due to what terry taught me about testing the sockets (another thing i would not have known about) i found my V1 7AF7 loktal socket was bad,, replacing now with new.
found some shematic conflicts on 7AF7 updates as well that i am working though.
I am very very very very fortunate i primarily used the fold out diagram from chuck to work on this radio.
if i had used the pamplet technician rendition, i would have been totally wrong!!! everywhere and would probably have smoked this whole set.
question- do i calibrate R102?
On my R102 that was getting hot, with a 500 ohm installed i have about 300v on pin 3 of my dual 6k6's.
if i install the shematic call out 300ohm resistor the 6k6' voltages will go up and i dont think i want that?
I have purchased about 12 options to solve this resistor for heat and resistance calibration including 2) mouser 300ohm chassis mount reisistors.
I do like the mouser resistors but they dont "look" right for the time on the set. I have many tubular wire wound adjustable resistors that look more in line with the era. I know that if i put two 300ohm resistors in series that will get my voltage down some, the 7AF7 code 125 update says that the normal voltages of 225v on pin 3 of the 6k6's will read about 20v higher with this update.. so a target of 250v?
What is a desired voltage at pin 3 of the push pull 6k6's in order to maintain another half centry of life?
if i have the opportunity to calibrate R102 in order to control the 6k6's voltage and heat, i want to do that now.
i will be ready to install a solution here in a few hours.
----------------------------------------------------------------
here are the resistor options i have for now
4540-012 RESISTOR 50W 400, 50W, ADJ, 4 1/2" LONG... 5 3.25
4540-014 RESISTOR 50W 500, 50W, ADJ, 4" LONG, USED. 10 2.25
4540-044 RESISTOR 50W 250, 50W, ADJ, OHMITE, 4"L, U 1 2.25
4540-062 RESISTOR 50W 250, OHMITE 0568,50W,ADJ,4",U 1 2.75
4540-065 RESISTOR 50W 300, 50W, ADJ, 4"L, USED..... 1 2.00
4540-136 RESISTOR 50W 400, 50W, ADJ., 4" LONG, NEW. 1 4.25
4540-136 RESISTOR 50W 300, 50W, ADJ., 4" LONG, NEW. 1 4.25
RH050300R0FE02 -Desc.: Wirewound Resistors - Chassis Mount 50watt 300ohm 1% qty2 5.57 ea.
working on a way to make these hidden parts more accessable in the future without lengthening the leads... seems impossible.
Due to what terry taught me about testing the sockets (another thing i would not have known about) i found my V1 7AF7 loktal socket was bad,, replacing now with new.
found some shematic conflicts on 7AF7 updates as well that i am working though.
I am very very very very fortunate i primarily used the fold out diagram from chuck to work on this radio.
if i had used the pamplet technician rendition, i would have been totally wrong!!! everywhere and would probably have smoked this whole set.
question- do i calibrate R102?
On my R102 that was getting hot, with a 500 ohm installed i have about 300v on pin 3 of my dual 6k6's.
if i install the shematic call out 300ohm resistor the 6k6' voltages will go up and i dont think i want that?
I have purchased about 12 options to solve this resistor for heat and resistance calibration including 2) mouser 300ohm chassis mount reisistors.
I do like the mouser resistors but they dont "look" right for the time on the set. I have many tubular wire wound adjustable resistors that look more in line with the era. I know that if i put two 300ohm resistors in series that will get my voltage down some, the 7AF7 code 125 update says that the normal voltages of 225v on pin 3 of the 6k6's will read about 20v higher with this update.. so a target of 250v?
What is a desired voltage at pin 3 of the push pull 6k6's in order to maintain another half centry of life?
if i have the opportunity to calibrate R102 in order to control the 6k6's voltage and heat, i want to do that now.
i will be ready to install a solution here in a few hours.
----------------------------------------------------------------
here are the resistor options i have for now
4540-012 RESISTOR 50W 400, 50W, ADJ, 4 1/2" LONG... 5 3.25
4540-014 RESISTOR 50W 500, 50W, ADJ, 4" LONG, USED. 10 2.25
4540-044 RESISTOR 50W 250, 50W, ADJ, OHMITE, 4"L, U 1 2.25
4540-062 RESISTOR 50W 250, OHMITE 0568,50W,ADJ,4",U 1 2.75
4540-065 RESISTOR 50W 300, 50W, ADJ, 4"L, USED..... 1 2.00
4540-136 RESISTOR 50W 400, 50W, ADJ., 4" LONG, NEW. 1 4.25
4540-136 RESISTOR 50W 300, 50W, ADJ., 4" LONG, NEW. 1 4.25
RH050300R0FE02 -Desc.: Wirewound Resistors - Chassis Mount 50watt 300ohm 1% qty2 5.57 ea.
