Forgot to mention, it is probably a grounded-grid design (don't see any input tuning). Underneath, there should be two long ferrite transformers connected between the filament transformer and the filaments of the 813's. If there are, the circuit is a grounded grid linear amplifier. You should be able to find circuits for the amp in the 1960's ARRL handbooks or the Editor and Engineer's handbooks.
73 de Bill, ab6mt [EMAIL PROTECTED] ----- Original Message ----- From: "Bow" <[EMAIL PROTECTED]> To: "Discussion of AM Radio in the Amateur Service" <amradio@mailman.qth.net> Sent: Saturday, April 21, 2007 2:18 AM Subject: [AMRadio] My Amplifer Quest took a strange turn today Yup, I headed to the local Radio store to have my Yeasu 2 meter rig looked at (no TX). I found it it is a dead-duck, probably the processor, it will make a nice paperweight... ANYWAY... I'm talking with the owner about the fact I was looking for an amp, prefer tubes, mainly for use on 75M and maybe 10M... Around 600-700 watts... He thinks a bit and then rotates to his right and points up on the top shelf... "It was left here for a repair about 1.5 years ago, I got it repaired, the guy never picked it up... It is set-up for 75M and 40M.. Pair of 813's... Everything checks good on it, it’s a nice amp.. You can get it off my damn shelf for $75..." I couldn't reach for my wallet fast enough... Now the fun part begins... Can anyone ID it, or maybe point to a handbook that is may have come out of so I can get a schematic?? Here It Is: http://riley-music.com/BowsStuff/AMP/02Front.JPG http://riley-music.com/BowsStuff/AMP/04%20RightSide.JPG http://riley-music.com/BowsStuff/AMP/05LeftSide.JPG http://riley-music.com/BowsStuff/AMP/06Rear.JPG http://riley-music.com/BowsStuff/AMP/07PowerTranny.JPG http://riley-music.com/BowsStuff/AMP/08CoilAndCaps.JPG http://riley-music.com/BowsStuff/AMP/09_813a.JPG http://riley-music.com/BowsStuff/AMP/10_813bChoke.JPG http://riley-music.com/BowsStuff/AMP/11Interior.JPG And Even though I have not fired it up yet, I did light off the filaments... I think EVERY piece of tube gear should have a window... http://riley-music.com/BowsStuff/AMP/12MagicInTheWindow.JPG http://riley-music.com/BowsStuff/AMP/13Glowin813s.JPG So, can anyone help me ID my score?!?!? Bow W5EFR -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.5/769 - Release Date: 4/19/2007 17:56 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.5.5/769 - Release Date: 4/19/2007 17:56 ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
