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Stancor A-8101 Output Transformer - modern replacement?

Hello all,

First post here. I have an old 1950's Stancor A-8101 5W universal line to voice coil transformer. I'm using it to couple household 120v AC mains to the output of an old Eico 377 audio sine wave generator that I believe uses 6K6 output tubes. Some old school clocks I'm working on require a high frequency signal sent over the AC line to engage the correction mechanism. This setup working perfectly, but the Stancor transformer is in fairly poor physical shape.

I'd like to replace it with a modern equivalent if possible. The Stancor catalog lists it as a 500 ohm primary side and either 3.2 ohm lug or 6-8 ohm lug on the secondary side. AC mains is hooked to secondary COM lug and 6-8ohm lug. I'm not very knowledgeable in this area, and researching hasn't really dug up a modern 500 ohm to either 6 ohm or 8 ohm one, much less one with a single 6-8 ohm secondary lug. Can I substitute a more common 600 ohm to 8 ohm transformer or is there a special reason why the Stancor transformer had a secondary range value 6-8 ohms instead of either 6 ohm or 8 ohm?

I have a few Bogen PA system 70v transformers, but was hesitant to try them and fry something. Basically, am I stuck with using old output transformers made over half a century ago?

Thanks,
Ian