FOR SALE: AM RACK TRANSMITTERS. E-mail [EMAIL PROTECTED] for pictures and more info.
Globe King 500-based Homebrew Transmitter. This is a homebrew transmitter in a 5 foot tall rack. It has 5 decks in the rack: 500B on top, speech amp, PP 811A modulator, modulator supply and RF deck supply. The key to this transmitter is the stock WRL 500B RF deck (bandswitching 160-10 meters). The rest of the rig is homebrew. But the circuit very closely follows the original WRL 500B transmitter. The modulation transformer is a fine-sounding Thordarson 300W Multi-match. Uses 3B28s in the power supplies. Rack has been repainted and looks great with stainless steel rack hardware. The mod deck has a cool windowed panel with a door that opens to allow access. Electrically, the transmitter is in good shape and working--Ive had it on 80 meters. It sounds very good. I started to re-do the AC wiring to the various decks and it is done, but still needs some tweaks (like power switching!). The modulator deck had a bad KV meter on it. I have a replacement meter for it, but you need to build the correct multiplier resistor to go with it. But you dont need that meter to operate--in fact, you could just eliminate the meter. The only other thing that you may want to add is a T/R relay. The 500B RF deck has a good, strong 4-400A in it instead of the WRL-specified 4-250. The 4-400A is loafing. The speech amp section was re-built by a prominent Pittsburgh-area AMer and now sports a compressor that can be switched in or out. With original WRL Globe King 500B manual and some builders handwritten notes. Pick-Up only in Pittsburgh, PA. $625 GWE III AM Transmitter. This is in a 5 foot wooden rack--very pretty with many matching meters. It uses plug-in coils and puts about 120 watts. This seemed to be working perfectly when I bought it but then discovered a strong parasitic in the exciter. This was fixed and the TX tests out good on 40 meters. No other bands were tested. Needs AC power rewired using 3-conductor grounded line. It could also use new HV connectors for safety. It was all built by N3GWE, Ed Mantick. It was purchased by me in September, 2002 after Ed needed to sell it due to the onset of health problems. Final: 812, Exciter: 6AG7s driving 807s, Modulator: 45s driving 809s, Power Supplies: Solid State. Eds original documentation goes with it. This uses Eds modified Eico 722 VFO. This rig uses plug-in coils and a full set is included. $450 with coils and modified Eico 722 (N3GWE Modified Eico 722 VFO notes: Modifications include 6AH6 in place of 6AU6 and power supply changed to full wave rectifier using a better transformer. Repainted nicely with black case. Looks good. Working perfectly and quite stable after 20 minutes.) Pick-up Only In Pittsburgh, PA. Gross CB-80 transmitter. This is the only one of these transmitters that has survived--there are no others anywhere on Earth. This is a 1936-vintage 5-foot high rack transmitter for AM and CW covering 10 through 80 meters with plug-in coils. It has a 42 crystal osc into a 6L6 buffer driving an Eimac 35T in the final. The modulator is a pair of 6L6's. I think it is all original looking, though it may have some very old mods that I can't tell from original. The one unoriginal appearing thing about it is the RF ammeter in the antenna matching section, which is definitely not original--though it looks very close. Also, the antenna matching section has been basically gutted and will have to be rebuilt. The matching section originally had two caps and some coils in it. But only the caps remain. This rig has the optional meter panel with 4 surface-mount Gross-logo'ed meters that plug into various spots on the rig with 1/4 inch phone plugs. The one coil installed in this thing probably isn't right--it's a EFJ edgewound type. So you should plan on building a set of coils for it. I have most of the original documentation including schematics. The documentation is very fragile but I also have photocopies. The rack is made for this rig and each chassis can be slid out on metal flanges. It has the original paint, Gross name tag and looks pretty sharp for its age. Naturally, this is pickup only in Pittsburgh, PA. If you want something absolutely unique and one-of-a-kind in your shack that connects you to the first golden age of ham radio in the 1930's, then this will be quite a conversation piece for you. This rig appeared in CQ Classics calendar in 1999. $750. 1939-vintage PP 250TH open rack TX with pp 810 modulator and 1930s UTC kit speech amp. The exciter is a Gross CW-55 (the only one known to exist--it is featured in the 2007 CQ Classics calendar). This vintage transmitter is in the classic open rack stylethe rack is home made of riveted steel anglesthe shelves are wood. The PS on the bottom deck may need some help from an external PS--it does not look beefy enough to run the whole rig--exciter, the RF amp and modulator. The speech amp is a separate unitit was a 1930s UTC kit. Its in 2 ventilated cabinetsone for the speech amp PS and one for the speech amp itself. I believe it uses PP 6L6s. Beautiful transmitter from the first golden age of ham radio. $975. Package Deal: Take all 4 rigs in one load for $2,350. Contact Don, N3RHT at [EMAIL PROTECTED] Please pass this along to anyone you think might be interested. Date: June 24, 2007 ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
