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Total 63 documents matching your query.

1. [Amps] Remember this project - tube (6l6?) CW filter using 88 mH telecom coils (score: 1)
Author: "Jeff AC0C" <>
Date: Mon, 6 Apr 2015 23:34:57 -0500
If you recall a published project like this, please contact me. I built this thing as my first project as a kid it was about 1975 and I would guess the design for it was published in a magazine or ol
/archives//html/Amps/2015-04/msg00049.html (7,039 bytes)

2. Re: [Amps] Arctic Silver (score: 1)
Author: "Jeff AC0C" <>
Date: Sun, 12 Apr 2015 11:56:48 -0500
Ceramique 2 - $8 for one tube. $13 for two. 73/jeff/ac0c alpha-charlie-zero-charlie FWIW, my local RadioShack carries Artic Silver. I don't know what they charge for the stuff. There was
/archives//html/Amps/2015-04/msg00084.html (14,373 bytes)

3. Re: [Amps] Time for New Power Meter (score: 1)
Author: "Jeff AC0C" <>
Date: Mon, 20 Apr 2015 22:07:15 -0500
I have the LP100a with the dual auto-switching sensor head. Very handy for So2r. 73/jeff/ac0c alpha-charlie-zero-charlie --Original Message-- From: Chuck Curran Sent: Monday, April 20, 2
/archives//html/Amps/2015-04/msg00149.html (10,321 bytes)

4. Re: [Amps] SPE 2K RTTY Duty Cycle (score: 1)
Author: "Jeff AC0C" <>
Date: Fri, 22 May 2015 22:24:05 -0500
The best way to find out if your stuff is solid from A-Z is to participate fully in a RTTY contest. At the end, you will either have working stuff and be confident it's up to the challenge - or you w
/archives//html/Amps/2015-05/msg00170.html (11,917 bytes)

5. Re: [Amps] Why not use the ORANGE button? (score: 1)
Author: "Jeff AC0C" <>
Date: Sat, 23 May 2015 21:34:34 -0500
In class A, the 3rd harmonic content is somewhat less, and the higher order products are way down. Without that feature enabled (the usual AB), the 3rd is stronger and all of the usual higher order p
/archives//html/Amps/2015-05/msg00178.html (8,262 bytes)

6. Re: [Amps] Real danger to use the ORANGE button (score: 1)
Author: "Jeff AC0C" <>
Date: Sun, 24 May 2015 01:24:53 -0500
As far as I know, the older MP1K's output problems with class A are not represented in the 5K series. Is there data proving the case otherwise? 73/jeff/ac0c alpha-charlie-zero-charlie Ch
/archives//html/Amps/2015-05/msg00181.html (12,113 bytes)

7. Re: [Amps] tetrode push-pull amp schematics (score: 1)
Author: "Jeff AC0C" <>
Date: Thu, 18 Jun 2015 01:52:15 -0500
I'm not sure the gentlemen's value assessment on the amps various attributes (other than the focus on clean) - but there is definitely merit to having done something uncommon - just for the sake of d
/archives//html/Amps/2015-06/msg00056.html (13,226 bytes)

8. Re: [Amps] Odd query.... (score: 1)
Author: "Jeff AC0C" <>
Date: Fri, 24 Jul 2015 14:46:11 -0500
Some would argue - correctly in my view - that the deep frying a turkey in peanut oil would be a far more satisfying project than building an amp which is submersed in oil. 73/jeff/ac0c
/archives//html/Amps/2015-07/msg00123.html (9,963 bytes)

9. [Amps] WTB: Groth TC3 knobs (score: 1)
Author: "Jeff AC0C" <>
Date: Sun, 23 Aug 2015 13:46:38 -0500
Wanted to buy: 3 sized TC3 graduated knobs. Qty 3. If you have some you can part with, kindly drop me a line by separate email. Thanks! 73/jeff/ac0c alpha-charlie-zero-charlie __________
/archives//html/Amps/2015-08/msg00077.html (6,384 bytes)

10. Re: [Amps] question about SPE 1.3K FA amp (score: 1)
Author: "Jeff AC0C" <>
Date: Thu, 12 Nov 2015 15:12:14 -0600
Here's an alternative to that Yaesu VL-2000 that never came to market. 73/jeff/ac0c alpha-charlie-zero-charlie Quadras aren't bullet-proof; the
/archives//html/Amps/2015-11/msg00077.html (11,769 bytes)

11. Re: [Amps] More on "baby ur radio" (score: 1)
Author: "Jeff AC0C" <>
Date: Sat, 19 Dec 2015 22:40:28 -0600
Migration is a real phenomenon but it's a quality defect, and not part of the normal operation. Google "purple plague." I am interested to see if there are any data specific to idle hours on a power
/archives//html/Amps/2015-12/msg00035.html (9,311 bytes)

12. Re: [Amps] More on "baby ur radio" (score: 1)
Author: "Jeff AC0C" <>
Date: Sun, 20 Dec 2015 23:28:11 -0600
Bill, My experience was with logic parts (74xx and CD4xxx series variants and the follow-on families), not with discrete power devices and the characteristics may be different. However for the logic
/archives//html/Amps/2015-12/msg00039.html (9,762 bytes)

13. Re: [Amps] MFJ-(AMERITRON) ROLLER INDUCTOR? (score: 1)
Author: "Jeff AC0C" <>
Date: Sun, 25 Sep 2016 18:42:05 -0500
Bob, Been there, done it, wish I had not. A roller ends up giving you a lot of odd resonance points which can make you just crazy especially on the high bands. The Q of the roller is generally poor c
/archives//html/Amps/2016-09/msg00116.html (8,615 bytes)

14. Re: [Amps] Buzzing transformer (score: 1)
Author: "Jeff AC0C" <>
Date: Thu, 29 Sep 2016 15:53:47 -0500
My PA76 buzzes a bit. But I had another PA76 transformer from a guy who swapped it for a Dahl and that one sung like crazy. Used it for a ton of key down power tests on an amp I was building and it n
/archives//html/Amps/2016-10/msg00000.html (8,514 bytes)

15. Re: [Amps] Ameritron/MFJ ROLLER INDUCTOR for GS35b amp (score: 1)
Author: "Jeff AC0C" <>
Date: Sat, 1 Oct 2016 21:48:43 -0500
If you are going to put in a roller, my suggestion is to lay out the tank so that should you later want to change from the roller and implement a switched tank, then you physically can if needed. The
/archives//html/Amps/2016-10/msg00014.html (10,465 bytes)

16. Re: [Amps] Chimney for GS35B (score: 1)
Author: "Jeff AC0C" <>
Date: Fri, 28 Oct 2016 15:04:14 -0500
Mike, I used some silicone tubing intended for turbocharger interconnects that I bought from a racing parts outfit on the web. It's almost the exact right size and won't melt. It's about $20/foot or
/archives//html/Amps/2016-10/msg00134.html (8,212 bytes)

17. Re: [Amps] 3D Printed ABS Plastic for Chimneys? (score: 1)
Author: "Jeff AC0C" <>
Date: Wed, 23 Nov 2016 14:02:41 -0600
There's not an issue with RF as you suspect assuming the pigments or any additives in the ABS are not RF conductive - but the heat is a problem. Pure ABS is a low temp material and that tube is going
/archives//html/Amps/2016-11/msg00109.html (10,238 bytes)

18. Re: [Amps] The cost of amplifiers, radios (score: 1)
Author: "Jeff AC0C" <>
Date: Sat, 3 Dec 2016 21:46:42 -0600
I agree with that. The problem is a lot of guys get into a HB project specifically out of a thought that 1) HB will be cheap and 2) how hard can it be. A lot more money than they expected, and a lot
/archives//html/Amps/2016-12/msg00046.html (10,664 bytes)

19. Re: [Amps] The cost of amplifiers, radios (score: 1)
Author: "Jeff AC0C" <>
Date: Tue, 6 Dec 2016 18:49:07 -0600
I was doing some characterization of a SB220 transformer for a 1KW RTTY amp build a few years back. The SB220 transformer did not make the cut, in fact the SB200 transformer was nearly bullet-proof b
/archives//html/Amps/2016-12/msg00155.html (11,720 bytes)

20. Re: [Amps] Pulls? (score: 1)
Author: "Jeff AC0C" <>
Date: Wed, 7 Dec 2016 20:31:11 -0600
I don't think PULL has a generic meaning. How can you generalize with so many different tubes in so many different applications and with different thresholds for determining when to swap? You can fin
/archives//html/Amps/2016-12/msg00170.html (11,925 bytes)

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