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1. [Amps] Looking for design for 25-50W linear amplifier covering 50 MHz band (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Mon, 1 Nov 2010 13:13:00 -0700 (PDT); Needed as driver for HPA that requires 25W drive; prefer solid state for this stage. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2010-11/msg00004.html (7,007 bytes)
2. [Amps] Looking for applications/designs using Mitsubishi RD16HVF1 (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Mon, 8 Nov 2010 13:21:15 -0800 (PST); RD16HVF1 is TO220 packaged VHF FET; particularly interested in applications at 50 MHz. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co; /archives//html/Amps/2010-11/msg00050.html (6,796 bytes)
3. [Amps] Looking for top cover from Alpha 374/76/78 era amp (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Fri, 16 Mar 2012 06:05:48 -0700 (PDT); Looking for a top cover for same - can be ugly but should be basically straight. If you have one left over from replacement and wish to sell (ship to Colorado) pls e-mail wb0gaz@yahoo.com TKs 73 ____; /archives//html/Amps/2012-03/msg00188.html (6,568 bytes)
4. [Amps] Guidelines/ideas/references for using toroids in HF tube amp tank circuit? (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Sat, 24 Mar 2012 08:03:34 -0700 (PDT); I'm looking at alternatives to rebuild a tank circuit in a 1.5kw HF amp. I'm interested in using toroids rather than air-core coils and with that, a different (non-tapped, separate coil for each band; /archives//html/Amps/2012-03/msg00256.html (7,133 bytes)
5. Re: [Amps] Guidelines.....toroids for tank ckts (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Wed, 28 Mar 2012 06:28:04 -0700 (PDT); Thanks for the many replies to the thread. Here's my take-away - 1. Single toroid per band. 2. 160 and 80M are OK, 40M is iffy, 20M and above is not a good idea. 3. Insulating procedure necessary 4.; /archives//html/Amps/2012-03/msg00291.html (8,715 bytes)
6. [Amps] Sharing 15 and 10M on a single band switch position? (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Wed, 28 Mar 2012 06:32:40 -0700 (PDT); My emerging project amp (a reconstituted Alpha 76A that is missing it's tank circuit) would normally require a 6-position band switch, but the switches I have (one and a spare) are 5-position. I'm th; /archives//html/Amps/2012-03/msg00292.html (7,230 bytes)
7. Re: [Amps] Sharing 15 and 10M on a single band switch position? (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Wed, 28 Mar 2012 11:38:28 -0700 (PDT); Ceramic/porcelain, contacts are about 3-4mm diameter each. Is the likely problem excess RF current through the contacts on 15M at maximum output due to insufficient inductive reactance on 15M? What a; /archives//html/Amps/2012-03/msg00310.html (9,730 bytes)
8. [Amps] PIV requirement for identical, individual diodes used in a bridge rectifier configuration? (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Fri, 20 Apr 2012 09:17:42 -0700 (PDT); In my example, a 1600VAC transformer secondary is connected through bridge rectifier (built from 4 individual diodes each rated 2000V PIV; current is not a concern here) into a filter capacitor. Do I; /archives//html/Amps/2012-04/msg00199.html (7,059 bytes)
9. Re: [Amps] PIV requirement for identical, individual diodes (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Tue, 24 Apr 2012 15:59:52 -0700 (PDT); Thanks everyone for the excellent discussion - very worthwhile and the numerous comments are all very gratefully appreciated. Dave _______________________________________________ Amps mailing list Am; /archives//html/Amps/2012-04/msg00230.html (7,844 bytes)
10. [Amps] Use of 12V/115V inverter to power small tube amp? (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Wed, 20 Jun 2012 16:07:32 -0700 (PDT); Any issues/suggestions/ideas/pointers to previous discussions re using a 12VDC/115VAC consumer inverter for powering of a small tube amplifier (assuming adequate/stable 12V DC source, of course)? Exa; /archives//html/Amps/2012-06/msg00308.html (7,945 bytes)
11. Re: [Amps] Use of 12V/115V inverter to power small tube amp? (score: 1): Author: David Feldman <wb0gaz@yahoo.com>; Date: Wed, 20 Jun 2012 19:52:22 -0700 (PDT); Jim, Jerry - Good points - much appreciated. The project I have in mind is a 6M amp using a GI-7B tube that can be used when roving (12V supply), so the Hercules 2 (or Metron MA-1000B, or a few other; /archives//html/Amps/2012-06/msg00316.html (9,750 bytes)

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