RC circuits

10/29/2009 10:51:40 PMBob B

I have a Radiola 20 battery set with both interstage transformers open on both primary and secondary windings.

Has anyone had success replacing these metal core transformers with an RC circuit? What values might I experiment with?

10/30/2009 12:43:27 AMgeorge

I would get the modern day replacements that fit inside of the metal cans....well worth it

:I have a Radiola 20 battery set with both interstage transformers open on both primary and secondary windings.
:
:Has anyone had success replacing these metal core transformers with an RC circuit? What values might I experiment with?
:

10/30/2009 7:14:30 AMBob B

Thanks George.I am was not familiar with them. I presume you are referring to what I find referred to as an A-53-C.

Brian Belanger wrote a piece about using both RC and xfrmr at the same time, here

http://docs.google.com/gview?a=v&q=cache:SKOXOoscOXoJ:www.trft.org/b3/B3Pix/CHRSReplacingAudioStageTrans.pdf+interstage+transformer+replacement+antique&hl=en&gl=us&sig=AFQjCNEQUGF7M7BgtkamxFzTpOp_i9D5_g

Now that is one monster URL !!

10/30/2009 9:45:00 AMRadiodoc

Bob B.,

You may want to check out:

http://www.antiquewireless.org/otb/resto802.htm

for even another posibility.

Radiodoc
****************

:Thanks George.I am was not familiar with them. I presume you are referring to what I find referred to as an A-53-C.
:
:Brian Belanger wrote a piece about using both RC and xfrmr at the same time, here
:
:http://docs.google.com/gview?a=v&q=cache:SKOXOoscOXoJ:www.trft.org/b3/B3Pix/CHRSReplacingAudioStageTrans.pdf+interstage+transformer+replacement+antique&hl=en&gl=us&sig=AFQjCNEQUGF7M7BgtkamxFzTpOp_i9D5_g
:
:Now that is one monster URL !!
:
:

10/31/2009 1:05:25 PMBob B

Thanks Radiodoc

10/31/2009 2:16:47 PMNorm Leal

Hi Bob

If you have an original audio interstage transformer from your Radiola 20 the coil can be replaced. The coil sold by AES and Radio Daze has a 1/2 x 1/2 opening. These will fit inside the Radiola transformers.

Older transformers are held together by screws. Your transformers may be held with rivits. If so they can easily be drilled out and replaced by screws.

Inside of the transformer will be filled with rosin. It comes out easily.

Norm

:Thanks Radiodoc
: