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Title: BC 610 model I question Post by: WC4D on July 24, 2019, 07:46:47 PM I have a BC 610 I model and I was wondering if anyone had ever used a B&W 850 tank coil to replace the plug in coils that the 610 uses. I have the tank coil and I've been told you can't switch them out and use the B&W coil as a replacement. I was just wondering if anyone had ever tried and did it and if you did just what does it take to make that change? I have a full set of plug in coils but I just think it would be nice to have one tank coil in there and not have to do all the switching.. I'm going to used a VFO instead of the tuning units also .. I just wonder if my thought would work or not .. any ideas would be wonderful..
73 Don WC4D Title: Re: BC 610 model I question Post by: WD5JKO on July 24, 2019, 08:16:29 PM Don,
Some things to consider are neutralization, stage gain, and stability. As I recall, the 610 uses plate side neutralization with a split stator tuning capacitor, and a push pull plug in plate coil. Going to a 850 means essentially a pi-net output. The need to neutralize still exists. Going to grid side neutralization is a possibility, but that means lots of modifications, and debugging. You might get by without neutralization if you go to a Tetrode final, but then the stage gain goes way up, and stability will be a big issue. The addition of a screen supply will be an additional task. If you have lots of parts, lots of time, and have a good RF background, then why not do some experimenting? My bet, even if you move forward, at some point it will go back to stock, or nearly so. Jim Wd5JKO Title: Re: BC 610 model I question Post by: WC4D on July 24, 2019, 08:25:35 PM Well Jim you told me just what I had heard already in so many words but you made it quite clear and it's all about the neutralization and that's what I heard I would have to overcome. I sure don't have any background in RF so I guess I'll keep it stock and run it like it should be run. I have a great looking rig and I shouldn't even think of doing anything to it. I'll send a couple of pictures..it was just a big hope I guess and I'll have to find me a good chicken stick to do my dirty work.. Thank you again .. I also thought about using a Johnson Ranger to drive it with but I can't find any information on how to do that either .. so stock it will stay .. 73 and thank you for responding .. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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