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Thanks for that, Lou. And I re-read the meter explanation in the Heathkit manual and saw what you said. The end of the white range is 100 mA. This may or may not be an issue but I do not show any

Skip, he is reading the grid current wrong!!!!!! ?THE SB200 amp does not have a graduated scale for grid current!!!!!! It only has a white area as a safe zone. ?The last mm of the white zone is 100

Warren, at 50 mhz the neutralization on 572b tubes?is way out in outer space. ?It’s bad enough on 10 meters let alone on 50mhz. ?That said, you can’t expect a dip in the plate at maximum

Chuck, The grid question is a good one and there is NO schematic of the conversion. It is written on the "manual" page in big script that there is no schematic. That is part of the reason I am

This is interesting…was this amp modified for grid drive instead of grounded grid? Another possibility is that there could be a bit of positive feedback, not enough to cause self oscillation but

Steve, With no REL PWR function, I have just been peaking everything up using a watt meter. Like you, I am a little bit curious as to why it only takes 18 watts of drive to get 600 out. I just wrote

Lou, I am tuning it to keep the grid current at 500 mA or less. The white area tops at 500 mA so that is what I have been referencing. This is a very touchy tank circuit! The amp came with some pencil

Something doesn't sound right... you shouldn't be able to get 500 mils grid current and still have working tubes, ESPECIALLY with only 18 watts drive... That's a RIDICULOUSLY-LOW amount of drive; most

The grid current?isn’t 500, it’s has?nothing to do with the scale reading. ?As long as it’s in the white area it’s ok. ?With the 572b tube it’s the temperature of the plates that is the

If his license expired that long ago , his e-mail is not valid any longer, and his phone is disconned... that doesn't bode well. If I still lived in Mashachewzits, I'd take a drive up there to see

OK. Thanks for the replies, guys. I am getting 600 watts out at 18 watts of drive with the load backed off CCW ~25 watts from peak (per the instructions). The grid current is at 500 mA. The plate

Carl hadn’t been in on the various groups since before Covid. ?Reports say he’s ok but probably got tired of fighting on the groups and is pounding sand somewhere else. Sent from the all new

Can anybody with a two tube 2500 Commander ( those with grid trip protection) tell me at what grid current their amp trips out at? ?I have an older model in for work and it doesn’t have a grid

Carl's Extra License expired last October. Don W4DNR

Good morning, all. I recently acquired a converted 6-meter amp that is named the SB-206. It was converted by KM1H in 2006 from an SB-200 and it actually works very well. I have been very carefully

Hi Lou: I resent the message I had previously sent you directly. I would prefer to discuss this off list. 73, Steve Sent: Tuesday, December 19, 2023 9:16 PM To:

Steve, I don’t remember getting any email. ?If you want?to send me the capacitor I’ll try to rebuild it for you. ?Lou Sent from the all new AOL app for iOS

Hi Lou: I sent a reply to this message on Sunday December 10th to your direct email address, but did not hear back from you. Can you still help with plates for the Centurion Plate Tuning cap?

I have a bad roller wheel on a 3K roller inductor. ?Anybody have a replacement or know of a replacement? Lou Sent from the all new AOL app for iOS

Thanks everyone. If anyone has replaced one with a more powerful one, please fill me in on what you got etc. Bob W4JFA