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Title: 250 TL in a BC-610-I ??? Post by: N8ETQ on March 16, 2012, 01:38:24 PM Hi, Got a 610-I here for checkout and intial "Flame Up". Made by B&W say's the tag. Looks good and was allegedly in use. Has 250 TL in the PA. Can you do that? TIA /Dan Title: Re: 250 TL in a BC-610-I ??? Post by: KL7OF on March 16, 2012, 02:20:56 PM Ther 250 TL and the 250 TH have different bias requirements.....The 250th was the standard final in the BC-610 if I remember correctly...
Title: Re: 250 TL in a BC-610-I ??? Post by: W7TFO on March 16, 2012, 02:46:45 PM The low-mU "TL" will work OK, but carefully watch the plate current if drive is lost.
73DG Title: Re: 250 TL in a BC-610-I ??? Post by: N8ETQ on March 16, 2012, 09:19:11 PM hey Dennis and Steve, Thanks, I figured it would work, the low MU thing explains the nice new 807 IPA's in this thing! it came with the VFO, Manly device indeed. 73 /Dan Title: Re: 250 TL in a BC-610-I ??? Post by: W7TFO on March 16, 2012, 10:03:36 PM Looks as though you are set for RTTY now! :D
73DG Title: Re: 250 TL in a BC-610-I ??? Post by: k4kyv on March 16, 2012, 11:50:24 PM You might need to change the grid leak resistor for the TL. The grid drive with the new resistor will be lower and the bias will be higher. The TL will need more protective bias voltage than the TH. Check the tube charts. With the appropriate adjustments, the TL should work just as well as the TH. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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