One is a 4 mfd and the other is an 8 mfd.
I want to replace them and
I have a 4.7 50 Volt
and I have
10mfd 50 Volt
10mfd 160 Volt
10mfd 450 Volt

What would you advise me to use of these or should i order something of a closer match somewhere?
I cannot find any voltage specs in the schematic info I have or on the can on the chassis.
Bob

Bob,

From the caps you listed, you should use the 450 volt caps. The 10 MFD caps probably would be alright. One thing to note is the first cap coming off the rectifier. Its minus goes to the centertap of the power transformer high voltage winding and not to the chassis. I would suggest you completely isolate the old caps from the circuit.

Radiodoc

:One is a 4 mfd and the other is an 8 mfd.
:I want to replace them and
:I have a 4.7 50 Volt
:and I have
:10mfd 50 Volt
:10mfd 160 Volt
:10mfd 450 Volt
:
:What would you advise me to use of these or should i order something of a closer match somewhere?
:I cannot find any voltage specs in the schematic info I have or on the can on the chassis.
:Bob
:

I see that AES does have a 4.7 450 volt. Would I "gain" anything by waiting and ordering one of them instead of using a 10 mfd that I have on hand? Would YOU wait and get a 4.7 and stay closer to the original cap? If it really does not make any noticeable difference using the 10 mfd then I guess I would go ahead and keep working on the set rather than stopping to order a 4.7.
I'm going to try to hide the caps in the tall can that is now in place so the old caps will be completely and physically out of the set. I went to the trouble to hide the regular caps inside the bakelite blocks which worked nicely and was not all that difficult or time consuming as I thought it would be. Not that I am getting "purist" but the blocks had oozed some of the black crap out of the bottom of a few of them and had
made a mess of things nearby. Lots of cleanup on this old set. It looked like it had been setting in an open dust bowl shack for 50 years but amazingly it
still worked albeit on one local powerful station. I know I should not have tried that but I did it before I knew any better. I am still very new to this hobby.
Bob

:Bob,
:
:From the caps you listed, you should use the 450 volt caps. The 10 MFD caps probably would be alright. One thing to note is the first cap coming off the rectifier. Its minus goes to the centertap of the power transformer high voltage winding and not to the chassis. I would suggest you completely isolate the old caps from the circuit.
:
:Radiodoc
:
:
::One is a 4 mfd and the other is an 8 mfd.
::I want to replace them and
::I have a 4.7 50 Volt
::and I have
::10mfd 50 Volt
::10mfd 160 Volt
::10mfd 450 Volt
::
::What would you advise me to use of these or should i order something of a closer match somewhere?
::I cannot find any voltage specs in the schematic info I have or on the can on the chassis.
::Bob
::

Bob,

It is up to you. I can't see that a couple of 10 MFD caps would hurt anything. Probably reduce the power supply hum a bit more. If you stuff the old metal caps, be sure to take note of the first one I mentioned that has its minus connected to the HV winding centertap. If these caps are the type that used a threaded stud with nut to mount, make sure that you replace the insulating washer(s) properly. Some were mounted using a clamp around the base of the cap with paper insulation between the cap and the clamp to insulate it from the chassis.

Radiodoc

:I see that AES does have a 4.7 450 volt. Would I "gain" anything by waiting and ordering one of them instead of using a 10 mfd that I have on hand? Would YOU wait and get a 4.7 and stay closer to the original cap? If it really does not make any noticeable difference using the 10 mfd then I guess I would go ahead and keep working on the set rather than stopping to order a 4.7.
:I'm going to try to hide the caps in the tall can that is now in place so the old caps will be completely and physically out of the set. I went to the trouble to hide the regular caps inside the bakelite blocks which worked nicely and was not all that difficult or time consuming as I thought it would be. Not that I am getting "purist" but the blocks had oozed some of the black crap out of the bottom of a few of them and had
:made a mess of things nearby. Lots of cleanup on this old set. It looked like it had been setting in an open dust bowl shack for 50 years but amazingly it
:still worked albeit on one local powerful station. I know I should not have tried that but I did it before I knew any better. I am still very new to this hobby.
:Bob
:
:
::Bob,
::
::From the caps you listed, you should use the 450 volt caps. The 10 MFD caps probably would be alright. One thing to note is the first cap coming off the rectifier. Its minus goes to the centertap of the power transformer high voltage winding and not to the chassis. I would suggest you completely isolate the old caps from the circuit.
::
::Radiodoc
::
::
:::One is a 4 mfd and the other is an 8 mfd.
:::I want to replace them and
:::I have a 4.7 50 Volt
:::and I have
:::10mfd 50 Volt
:::10mfd 160 Volt
:::10mfd 450 Volt
:::
:::What would you advise me to use of these or should i order something of a closer match somewhere?
:::I cannot find any voltage specs in the schematic info I have or on the can on the chassis.
:::Bob
:::

:One is a 4 mfd and the other is an 8 mfd.
:I want to replace them and
:I have a 4.7 50 Volt
:and I have
:10mfd 50 Volt
:10mfd 160 Volt
:10mfd 450 Volt
:
:What would you advise me to use of these or should i order something of a closer match somewhere?
:I cannot find any voltage specs in the schematic info I have or on the can on the chassis.
:Bob

The highest Voltage I can find on page 2 of the "Resources" section Voltage table is 250, so I would use at least 300 Volts. I would also keep the values of capacity close to the original.

Lewis L.

:

Just as general rule that I use for myself. When a radio has a #80 rectifier (especially pear shaped) I try to keep the power supply filter capacitors under 30 mFd. I also like to use 450 volt capacitors as the initial turn on voltage surge can exceed 1.5 time the actual running voltage. My standard generic capacitor I keep on hand is a 22mFd 450 volt. I have seen #80 arc when too much capacitance is in the circuit. I hope this helps.

MRO

:One is a 4 mfd and the other is an 8 mfd.
:I want to replace them and
:I have a 4.7 50 Volt
:and I have
:10mfd 50 Volt
:10mfd 160 Volt
:10mfd 450 Volt
:
:What would you advise me to use of these or should i order something of a closer match somewhere?
:I cannot find any voltage specs in the schematic info I have or on the can on the chassis.
:Bob
: