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1. [AMPS] In Search Of: The Nearly Perfect T-R Switch (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK); Date: Mon, 5 Jul 1999 18:26:07 -0400; It was 1983/1984 ... the QSK-1500 was introduced at the 1984 Dayton Hamvention. Design Electronics Ohio was Dr. John Sheller, K8RR (then KN8Z). I was involved in designing most of the control circui; /archives//html/Amps/1999-07/msg00074.html (10,230 bytes)
2. [AMPS] 4cx10000 (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK); Date: Thu, 8 Jul 1999 19:58:31 -0400; Econco have repeatedly stated the 8171 and similar tubes could be rebuilt essentially forever since the anode can be removed without loss of metal. In those tubes which require cutting the ceramic-m; /archives//html/Amps/1999-07/msg00151.html (8,491 bytes)
3. [AMPS] TL-922 Filament Transformer Protection (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK/4); Date: Sun, 6 Jun 1999 22:25:02 -0400; "Hot switching" causes a transient in anode current by changing the load (specifically, the plate load impedence). Once the output contacts close, the impedence changes abruptly and there is a disco; /archives//html/Amps/1999-06/msg00177.html (9,943 bytes)
4. [AMPS] slam tally (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK/4); Date: Tue, 8 Jun 1999 22:48:37 -0400; Rich runs this non-issue into the ground again ... WA4GPM is no longer employed at Eimac/Varian as he left to join Triton when the glass tube division was sold and moved east. Since you called Eimac/; /archives//html/Amps/1999-06/msg00283.html (9,579 bytes)
5. [AMPS] slam tally (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK/4); Date: Wed, 9 Jun 1999 19:55:06 -0400; Did is ever occur to you that "Engineer B" can have different meanings depending on the organization (company)? I've been in some companies, even negotiated union contracts, in which the "pecking or; /archives//html/Amps/1999-06/msg00314.html (10,031 bytes)
6. [AMPS] Care and feeding of your Eimac 3-500 (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Wed, 3 Mar 1999 11:32:56 -0500; In case you hadn't noticed ...in many technology companies, even the people in the marketing departments have a technical background. I know several current or former CPI/Eimac "marketing" staff who; /archives//html/Amps/1999-03/msg00066.html (9,380 bytes)
7. [AMPS] Ripple Current (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Tue, 9 Mar 1999 17:42:25 -0500; The common voltage doubler is a "full wave voltage doubler" ... as such the capacitor bank gets 120 Hz ripple. The charge gets piled on top of the stack on one half cycle and pulled out of the botto; /archives//html/Amps/1999-03/msg00196.html (8,441 bytes)
8. [AMPS] Output power 8877 (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Mon, 15 Mar 1999 11:19:34 -0500; Eimac's spec sheets show two-tone numbers ca. 65% of the single tone value. As such, the 1200 watts of two-tone power would reprecent about 1800 watts of carrier. The only way I know of to measure t; /archives//html/Amps/1999-03/msg00312.html (7,948 bytes)
9. [AMPS] Hearter Warm-up Times ... (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Wed, 17 Mar 1999 10:38:09 -0500; Rather than argue about "instant on" tubes versus turning on the amplifier when one enters the shack .... Does anyone have reliable data on holding tube heaters at a temperature low enough to elimina; /archives//html/Amps/1999-03/msg00367.html (7,745 bytes)
10. [AMPS] Grid driven triodes (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Tue, 30 Mar 1999 09:07:28 -0500; Bill, Check Jim Hawkins' site (http://www.exit109.com/~jimh/radio.shtml). He has stuff on several of the old-time "big iron" stations including VOA (Betany), WLW, etc. The sub-title on the site is:; /archives//html/Amps/1999-03/msg00686.html (8,543 bytes)
11. [AMPS] RE: (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Mon, 8 Feb 1999 19:24:07 -0500; Add to that the McMartin transmitter (forgot the model number ... it's been > 20 years) with the 8877 driven by a 4CX250 and a similar CCA transmitter. I suspect a great majority of the class A FM s; /archives//html/Amps/1999-02/msg00256.html (7,669 bytes)
12. [AMPS] What (modern) tube to use? (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Thu, 18 Feb 1999 15:54:11 -0500; The recent "amps" discussion of which tube to use for building a new CW amplifier started me thinking ... If one were building a new amplifier (or buying one of the new commercial units) what tube or; /archives//html/Amps/1999-02/msg00475.html (8,968 bytes)
13. [AMPS] What (modern) tube to use? (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Thu, 18 Feb 1999 18:26:51 -0500; OK ... I looked at my Varian catalog and the 103 Amps was for the "J" version of the 4CX5000/4CX1000. Still, the requirements for filament power, air socket and air flow are a bit stiff for the amat; /archives//html/Amps/1999-02/msg00482.html (8,970 bytes)
14. [AMPS] What (modern) tube to use? (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Fri, 19 Feb 1999 09:21:31 -0500; Terry, The 3CX1200A7 (instant on, reasonable drive/gain, etc.) is certainly an interesting tube but I'm concerned that the only commercial user seems to be Ameritron and I have my doubts about the lo; /archives//html/Amps/1999-02/msg00499.html (9,598 bytes)
15. [AMPS] What (modern) tube to use? (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Fri, 19 Feb 1999 10:34:02 -0500; Look carefully at Radiodan's Henry page ... the only desktop amplifier capable of 160-10 meters using the 3CX1200A7 is only rated a 750 watts DC (carrier). That doesn't even put Henry in the serious; /archives//html/Amps/1999-02/msg00504.html (10,295 bytes)
16. [AMPS] What (modern) tube to use? (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Fri, 19 Feb 1999 10:54:30 -0500; Commented on the Henry designs elsewhere ... The 4-400 is a rather special case. It's primary niche was in 1 and 2.5 KW AM broadcast transmitters. With the cost to retube a transmitter pushing $2 K; /archives//html/Amps/1999-02/msg00506.html (10,592 bytes)
17. [AMPS] What (modern) tube to use? (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Sat, 20 Feb 1999 00:10:02 -0500; Still, 550 watts of filament power and 120 to 150 CFM of airflow (Svetlana data sheets) seem a bit hefty for an amateur amateur amplifier. Of course, it looks like one of the 200 watt rigs will driv; /archives//html/Amps/1999-02/msg00522.html (9,440 bytes)
18. [AMPS] Tube selection (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Sun, 21 Feb 1999 12:26:05 -0500; to fillament The 3CPX5000 is the same tube as the 3CX15000A7 with the smaller anode of the 3CX5000A7. Take your drive information and plate curves from the 3CX15000B7 data sheet and the cooling info; /archives//html/Amps/1999-02/msg00572.html (7,955 bytes)
19. [AMPS] YC-156 (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Tue, 23 Feb 1999 10:23:24 -0500; This is the third (in addition to the larger filament power and cooling requirements) problem with using "tubes with handles" at amateur power levels. When underdriven the RL goes quite high - a 3CP; /archives//html/Amps/1999-02/msg00629.html (9,459 bytes)
20. [AMPS] Tube rating question (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Tue, 23 Feb 1999 23:09:05 -0500; The 750 watts is "useful power output," i.e. output after plate circuit losses. The real kicker is the MAXIMUM rated plate current of .6 Amps. With Max E and Max I that's 1350 max watts input or may; /archives//html/Amps/1999-02/msg00645.html (8,018 bytes)

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