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Turning a Crosley 66CS into a 66TC
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I've had a really nice wooden Crosley 66TC cabinet for quite a while with a trashed chassis to go with it. For about a year, I looked for a replacement, and finally found a 66CS (the console version with phono). They are almost identical as far as chassis size and electronics (same tube lineup, same power filter circuit, same tuning cap, etc.), but the speaker on the CS is 10" and the one for the TC is about 5". I fired up the Crosley 66CS tonight for the first time, and it is a great performer. Broadcast AND shortwave worked great. A nice lady in China was telling me things for a while. I put together a makeshift loop for it that I had a different thread about, and it picks up stations all across the dial, but I intend to order the repro back and mount a permanent loop on there.

These speakers are dynamic speakers, right? The one the chassis came with is too large to go in my 66TC cabinet, but I have that speaker that will fit (it came with the trashed chassis). The problem is that the field coil measures about 200 ohms less than the field coil on the 10" speaker that came with the chassis. Can you think of any reason why I couldn’t just swap the FCs on the speakers? The voice coils both measure basically zero. Or would it be better to make up the difference for the circuit with a resistor?

Here are the two pertinent schematics:

The Crosley 66CS (s) look at the one with the 40uf filter cap in addition to the 3 20uf: http://www.nostalgiaair.org/pagesbymodel...003572.pdf

The Crosley 66 TC: http://www.nostalgiaair.org/pagesbymodel...003576.pdf

Charlie in San Antonio


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Turning a Crosley 66CS into a 66TC - by ccomer1955 - 08-10-2015, 12:42 AM



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