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21. [AMPS] Tube rating question (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Wed, 24 Feb 1999 08:49:09 -0500; Terry, If the tube was designed for opration at 2500 volts 800 mA, why does the data sheet/catalog give 2200 volts 600 mA as "maximum ratings?" Why not simply show the lower "typical operation" numb; /archives//html/Amps/1999-02/msg00650.html (8,147 bytes)
22. [AMPS] Tube rating question (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Wed, 24 Feb 1999 09:50:04 -0500; My Eimac catalog shows essentially the same tube, the 3CPX800, rated for 3500 volts at 8 amps maximum (short pulse). I don't have the full data sheet so I can't make any determination of the average; /archives//html/Amps/1999-02/msg00651.html (8,613 bytes)
23. [AMPS] HV Power Supply for 3-500Z (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Wed, 24 Feb 1999 22:28:18 -0500; Since Rich didn't answer your question ... With a full-wave CT rectifier and capacitor input filter, the 2500 volt taps will provide 3250 volts no-load. The Eimac catalog lists normal operation of t; /archives//html/Amps/1999-02/msg00662.html (8,395 bytes)
24. [AMPS] YC156 ratings (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Fri, 26 Feb 1999 08:29:41 -0500; The 3CX15000B7 data sheet gives typical operating conditions of 10.2 KW upsful power with 6 KV at 2.6 Amps, 300 watts drive. By my calculations that results in slightly more than 5 KW anode dissipat; /archives//html/Amps/1999-02/msg00675.html (7,521 bytes)
25. [AMPS] Triode conected Tetrodes (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK); Date: Sun, 24 Jan 1999 18:28:32 -0500; The 304TH and 833A are moderate mu triodes, not tetrodes. They are specified for grid driven, AB2 (linear) service ... regularly used as both modulator and PA tubes in AM broadcast transmitters of t; /archives//html/Amps/1999-01/msg00380.html (8,526 bytes)
26. [AMPS] RE: [TowerTalk] hdbx or hbx? Or neither? (long, sorry) (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Wed, 27 Jan 1999 19:16:52 -0500; Louis, I have had Rohn BX series towers for TV use only (well, with a VHF antenna and wire dipole on the side mount) and even in Ohio, they pretty well shook apart in three or four years (12' boom "d; /archives//html/Amps/1999-01/msg00505.html (8,940 bytes)
27. [AMPS] meter question (score: 1): Author: W8IK@ibm.net (Joe Subich, W8IK/4); Date: Fri, 29 Jan 1999 14:31:38 -0500; When used in UHF television transmitters, this type of meter is not normally used for glitch protection. They are not fast enough to prevent damage from an arc (10 mF cap stores a huge amount of ene; /archives//html/Amps/1999-01/msg00579.html (7,502 bytes)
28. [AMPS] SB220 problems (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Sat, 26 Dec 1998 10:56:33 -0500; Install a larger (voltage) capacitor or a series resistor (47 Ohm 2 watt) ahead of the capacitor. 120 volts * 1.4 (for a capacitor input filter) is 168 volts on the capacitor ... it's too close for; /archives//html/Amps/1998-12/msg00412.html (8,667 bytes)
29. [AMPS] G2DAF (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Mon, 2 Nov 1998 22:39:23 -0500; However, if the three tone test is PROPERLY designed (with two of the tones very close together) the screen voltage will vary at a semi-sylabic rate and produce the wide variations in screen potenti; /archives//html/Amps/1998-11/msg00051.html (7,958 bytes)
30. [AMPS] filament pins (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Wed, 23 Sep 1998 20:51:06 -0400; Just make sure you completely rinse anything dipped in Tarn-X before putting it back together! The residue seems to be corrosive over the long term. I actually bought Tarn-X by the case (four each g; /archives//html/Amps/1998-09/msg00255.html (7,771 bytes)
31. [AMPS] Legal limit tuners (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Thu, 12 Mar 1998 21:34:36 -0500; One warning about the MT-2000/MT-3000 ... be careful with it on 10 meters. On 10, the coil is so short and the circulating current so high due to the close proximity of the case (shorted turn effect); /archives//html/Amps/1998-03/msg00221.html (7,950 bytes)
32. [AMPS] one more mla2500 question (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Mon, 16 Feb 1998 10:36:09 -0500; It's also possible that the MLA-2500 in question is one of the original designs with the dual voltage (SSB/CW) supply. In that case '1500V' is about right for the CW setting. However, since the multi; /archives//html/Amps/1998-02/msg00104.html (9,961 bytes)
33. [AMPS] one more mla2500 question (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Mon, 16 Feb 1998 15:18:22 -0500; I have in my possession EIMAC data sheet 357655/VA4588 (Effective 1 Dec 1983) for the 3CX800A7 that gives the following data for "typical operation" in cathode driven class AB2 service (to 150 MHz):; /archives//html/Amps/1998-02/msg00106.html (9,355 bytes)
34. [AMPS] TS930s-SB220 Interface (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Mon, 01 Dec 1997 20:36:22 -0500; In general PIN diodes have a limited current carrying capacity even when forward biased (biased ON). As the antenna system SWR increases, particularly with a LOW Z (open circuit with a 1/4 wave of fe; /archives//html/Amps/1997-12/msg00020.html (9,142 bytes)
35. [AMPS] Dentron MLA2500B (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Wed, 03 Dec 1997 20:56:03 -0500; Max ratings for the 8875 are 2200 volts at 350 mA or aproximately 1500 watts input. However, the Eimac catalog (4/92) I have lists operation at 2000 volts and 500 mA peak (per tube) with a resulting; /archives//html/Amps/1997-12/msg00062.html (8,800 bytes)
36. [AMPS] Dentron MLA2500B (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Thu, 04 Dec 1997 20:21:35 -0500; OOPS! I was actually thinking about the typical 100 W radio when I wrote that ... BFF syndrome! *I* learned my lesson about using the FT-1K to drive an MLA-2500 the hard (expensive) wasy ... by cooki; /archives//html/Amps/1997-12/msg00080.html (9,776 bytes)
37. [AMPS] Rebuilding an MLA2500 (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Wed, 10 Dec 1997 22:09:11 -0500; I would be very cautious of a single 3CX800 as a replacement for the pair of 8875s in the MLA2500. The 3CX800A7 is rated for 23 watts of drive and should give 750 watts output. While the gain is high; /archives//html/Amps/1997-12/msg00204.html (7,721 bytes)
38. [AMPS] FS: YC156 TUBES (3CX5000) (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Sat, 01 Nov 1997 09:52:25 -0500; I'm sure others will ask ... Which version of the 3CX5000? My old "Varian Power Grid Tube Catalog" shows four versions of the 3CX5000 (the A3, H3, A7, U7) but no YC-156. There is just a little differ; /archives//html/Amps/1997-11/msg00009.html (7,362 bytes)
39. [AMPS] Linear with 4CX800A (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Sat, 06 Sep 1997 22:19:32 -0400; If you are going to continue holding yourself out as the final arbiter of the right and wrong of amplifier design, and deride those with significantly more experience than you as "recognized experts,; /archives//html/Amps/1997-09/msg00130.html (11,001 bytes)
40. [AMPS] Linear with 4CX800A (score: 1): Author: w8ik@ibm.net (Joe Subich, W8IK); Date: Sun, 07 Sep 1997 09:34:37 -0400; Unfortunately, I wrote relatively late and didn't bother to go back to the refereence table ... I had chosen the 3-500Z/3-1000Z tube case because the two were generally operated at very similar plate; /archives//html/Amps/1997-09/msg00139.html (9,450 bytes)

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