>From the coil, it appears to be a 80 meter amplifier, might be 40 meters... It is probably a linear unless the transformer in the back of the 813's is a mod trannie. It has a PI output stage, would guess the coax feed from the loading capacitor (the big one) goes to either a t/r relay underneath or to the output SO-239 coax fitting.
The tuning capacitor is on the left, and the load capacitor is on the right. It seems to have an integral power supply, but rectifiers and caps are apparently underneath. It wouldn't hurt to bring it up with either a variac, or at least a 100 watt lightbulb in series with the 110VAC power supply, then energize the HV so that you don't shock the HV filter caps after all this time. Else you may have to replace them. A better way: If you have another power supply, even a transformer and a diode stack, it would be well to reform the filter caps by slowly charging the capacitors to their rated voltage. Keep the charge voltage low, with charge current under 5 ma and expect to increase applied voltage as you see charge current drop. The process can take a period of several hours. Who knows, it might work. Wouldn't hurt to apply a little soap and water. Don't trust any high-ohm power resistors such as found as bleeder resistors, they tend to open with age and moisture. Always ground the HV line with an insulated clip lead before you touch anything. Didn't hear anything on 3870 this evening either, but couldn't take the time to fire up the rig this evening. 73 de Bill, ab6mt [EMAIL PROTECTED] ----- Original Message ----- From: "Bow" <[EMAIL PROTECTED]> To: "'Discussion of AM Radio in the Amateur Service'" <[email protected]> Sent: Saturday, April 21, 2007 2:39 AM Subject: RE: ***SPAM*** [AMRadio] My Amplifer Quest took a strange turn today Yup, I figure it's a homebrew... I was just wondering if anyone has seen something like it in one of the old handbooks! Bow W5EFR -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of George Sent: Friday, April 20, 2007 22:33 To: 'Discussion of AM Radio in the Amateur Service' Subject: RE: ***SPAM*** [AMRadio] My Amplifer Quest took a strange turn today Looks homemade to me. See the extra holes in the chassis and the transformer mounted skewed. George KA5DEN -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bow Sent: Saturday, April 21, 2007 4:19 AM To: Discussion of AM Radio in the Amateur Service Subject: ***SPAM*** [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:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.4.0/762 - Release Date: 4/15/2007 4:22 PM -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.4.0/762 - Release Date: 4/15/2007 4:22 PM ______________________________________________________________ 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:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. -- No virus found in this incoming 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:[email protected] 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:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
