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Title: RME VHF-152A Post by: W7KVT on September 22, 2018, 07:55:06 PM My VHF-152A has a second 6AK5 that is not shown in the schematic. Is this a second RF amplifier that was added later in production?
Title: Re: RME VHF-152A Post by: Tom WA3KLR on September 23, 2018, 07:46:56 AM The converter has 4 tubes, are you saying yours has 5 tubes or is it that someone plugged a 6AK5 in the 6J6 socket?
Title: Re: RME VHF-152A Post by: W7KVT on September 24, 2018, 11:47:06 AM OK, I guess a better description is in order. My VHF-152 has 3 tubes in the RF section. 2 each 6AK5 and 1 6J6. The photo in the manual shows a plate covering the tube socket location nearest the front panel. In my case, the 6J6 is located there and 6AK5's are in the 2 sockets that should be for a single 6AK5 and the 6J6. All of this looks like original factory work. I don't know if my unit is an early version, or what?
Roger, W7KVT Title: Re: RME VHF-152A Post by: W7KVT on September 24, 2018, 04:08:00 PM My VHF-152 tube problem has been resolved. Further research indicates that I have the VHF-152, NOT the VHF-152A. It uses one 6AK5 as the RF amplifier and a second one as the mixer. One half of the 6J6 is used for the oscillator. I have a schematic in hand, so now I can proceed with my restoration. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Roger, W7KVT |