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1. [Amps] SB221 10m mod questions (score: 1): Author: Eric Dobrowansky <kk2ed@comcast.net> (Eric Dobrowansky); Date: Sun, 06 Oct 2002 14:11:34 -0400; I am looking to modify an SB221 for 10m. Does a stock SB221 have the extra band position contacts, or do I need a new switch? Next question - I found a web page which states to simply add the compone; /archives//html/Amps/2002-10/msg00045.html (7,571 bytes)
2. [Amps] Motorola 375w VHF amp w/ 2x8560AS (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Thu, 18 Sep 2003 01:20:06 -0400; Hello ALL, I am attempting to bring a 153MHZ Micor 375w 2x8560 PA down to the 147MHZ ham band. Currently, the grid and loading controls tune/peak with no trouble, but the Plate cap is at it's maximum; /archives//html/Amps/2003-09/msg00166.html (7,235 bytes)
3. Re: [Amps] Motorola 375w VHF amp w/ 2x8560AS (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Tue, 23 Sep 2003 15:34:18 -0400; Good News - At the rear of the bottom end of the plate bars, there are two overlapping, aluminum, horizontal fingers welded on to the bars, that are acting as a capacitor. I decreased the spacing bet; /archives//html/Amps/2003-09/msg00182.html (12,182 bytes)
4. [Amps] Help with TL922A PS trouble (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Wed, 10 Mar 2004 00:51:21 -0500; Hello to the group, I am repairing a TL-922A amplifier that keeps blowing the fuses. The first thing I found was a shorted 7.5v zener in the cathode/bias circuit. I replaced the diode, and checked th; /archives//html/Amps/2004-03/msg00085.html (8,333 bytes)
5. [Amps] Re: Amps Digest, Vol 15, Issue 12 (score: 1): Author: "Eric Dobrowansky, KK2ED" <kk2ed@comcast.net>; Date: Wed, 10 Mar 2004 11:10:30 -0500; Thanks to all for the initial replies. I may have not been too clear in my troubleshooting outline below as it was late and I was tired. I pulled the tubes before the testing outlined below, ruling o; /archives//html/Amps/2004-03/msg00096.html (11,222 bytes)
6. [Amps] Re: Amps Digest, Vol 15, Issue 19 (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Sun, 14 Mar 2004 18:07:47 -0500; Thanks for all the replies to my TL922 troubleshooting issue. Amazing what happens when you walk away from something and go back to it with a clear mind the next day! I found that the plate blocking; /archives//html/Amps/2004-03/msg00157.html (24,194 bytes)
7. [Amps] re: 572B (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Sat, 28 Aug 2004 15:02:46 -0400; Maybe you need to increase the cutoff voltage, as the amp may be oscillating when unkeyed. The Sletvana tubes require a higher cutoff voltage that the original CETRON tubes. Check out RFPARTS web sit; /archives//html/Amps/2004-08/msg00436.html (6,568 bytes)
8. [Amps] Re: Henry 2k (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Sun, 2 Jan 2005 22:34:15 -0500; Check the hardware for the tube sockets, and make sure there are no nuts missing on the underside of the chassis. I repaired a 2K not once, but twice, due to hardware vibrating off of the tube socket; /archives//html/Amps/2005-01/msg00032.html (6,989 bytes)
9. [Amps] Re: Ameritron 811 (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Mon, 3 Jan 2005 14:21:18 -0500; Most likely the tube in the socket with the blown resistor has developed an internal short. Call Ameritron and ask for replacement tubes if they are under warranty. I have repaired two 811s where one; /archives//html/Amps/2005-01/msg00042.html (7,047 bytes)
10. [Amps] trouble with FT101E amplifier (score: 1): Author: "Eric Dobrowansky, KK2ED" <kk2ed@comcast.net>; Date: Mon, 21 Feb 2005 12:37:45 -0500; Hello gang, I am attempting to repair a Yaesu FT101E I picked up on the cheap. There is a problem with the RF output PA. The pair of 6JS6Cs check out good. The problem is that the PA Loading and Plat; /archives//html/Amps/2005-02/msg00649.html (8,012 bytes)
11. Re: [Amps] shipping damge (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Sat, 26 Feb 2005 09:32:32 -0500; I had a TS940S damaged a few years ago. My first attempt at a claim was denied. Then it took two weeks to get the supervisor to respond. Only after staying on him did my claim get approved. They neve; /archives//html/Amps/2005-02/msg00851.html (6,850 bytes)
12. [Amps] FS: Henry 3K Premier (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Sun, 21 Aug 2005 16:41:03 -0400; FS: Henry 3K Premier amplifier 10-160m coverage, vacuum relay for qsk. 3CX1200A7 tube. 100w in yields 2000w out. Has factory installed "spinner" knob for plate tune, and factory casters to make movem; /archives//html/Amps/2005-08/msg00642.html (6,878 bytes)
13. [Amps] Henry 4k Ultra value? (score: 1): Author: "Eric Dobrowansky" <kk2ed@comcast.net>; Date: Mon, 2 Jan 2006 21:41:14 -0500; A good friend is looking to sell his Henry 4K Ultra (3cx1500a7) amp. It is in excellent condition. What is a fair price for one nowadays? Also, what is a spare 8877 tube worth (full output presumed)?; /archives//html/Amps/2006-01/msg00116.html (6,571 bytes)
14. [Amps] wanted: Bird 43 shell/case (score: 1): Author: kk2ed@comcast.net; Date: Fri, 03 Nov 2006 16:48:57 +0000; Good Morning. Have any of the amp builders on the list gutted a Bird 43 to use the line section and meter movement for an amp project? Want to get rid of the original case/shell? I picked up what loo; /archives//html/Amps/2006-11/msg00059.html (6,795 bytes)
15. [Amps] need 1000pf blocking cap (score: 1): Author: kk2ed@comcast.net; Date: Fri, 25 Jul 2008 14:13:56 +0000; Good Morning; I'm helping a friend repair an Amp Supply LK800 3x3CX800A7 amp which appears to have a bad plate blocking/coupling doorknop capacitor. It's an HEC HT-50 style 1000pf @ 5KV , X5V temp ra; /archives//html/Amps/2008-07/msg00245.html (8,557 bytes)
16. Re: [Amps] need 1000pf blocking cap (score: 1): Author: kk2ed@comcast.net; Date: Fri, 25 Jul 2008 16:41:37 +0000; What about my concern of RF current? Is it substantially higher than the DC current present at the plate choke? How does one go about determining the level of RF current? Can it be derived from Ohm's; /archives//html/Amps/2008-07/msg00256.html (11,543 bytes)
17. [Amps] Amp Supply LK800 trouble (score: 1): Author: kk2ed@comcast.net; Date: Thu, 21 Aug 2008 17:07:35 +0000; Good afternoon, I am still trying to help a friend get his LK800A amp going. Last visit, we thought the 1000pf plate blocking doorknob was bad and not passing RF, as the amp would draw 1A + of plate; /archives//html/Amps/2008-08/msg00118.html (7,969 bytes)
18. Re: [Amps] Amp Supply LK800 trouble (score: 1): Author: kk2ed@comcast.net; Date: Thu, 21 Aug 2008 19:49:34 +0000; Correct - blocking cap in series from the tube anode/parasitic junction with the plate choke, over to the PI network's coil. The unit had a 1000pf since day one, so I don't believe that is the issue.; /archives//html/Amps/2008-08/msg00120.html (9,913 bytes)
19. Re: [Amps] Amp Supply LK800 trouble (score: 1): Author: kk2ed@comcast.net; Date: Fri, 22 Aug 2008 15:50:45 +0000; Guys - Thanks for all the suggestions. I checked the ground connections from the load cap to the chassis. There is a jumper strap from the cap to the chassis, as well as the bolts holding it in place; /archives//html/Amps/2008-08/msg00124.html (8,119 bytes)
20. [Amps] amp related parts for sale (score: 1): Author: kk2ed@comcast.net; Date: Mon, 25 Aug 2008 16:53:35 +0000; I have the following amp related items for sale: All NOS, some still in paper wrappers: Qty 4 - CRL-M 857 100pf 10% 15kv N750 doorknob caps - $6 each Qty 2 - CRL-M 857 50pf 10% 15kv NPO doorknob caps; /archives//html/Amps/2008-08/msg00137.html (7,218 bytes)

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