- 1. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: zeitler@ibm.net (zeitler@ibm.net)
- Date: Wed, 9 Jun 1999 22:18:15 -0700
- Gents, The Heathkit SB-1000 amp has a very small (tiny) coil in series with the B- and also has a 1N5408 in parallel with the B- right after the tiny coil with the anode side to ground. Component des
- /archives//html/Amps/1999-06/msg00325.html (8,061 bytes)
- 2. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: measures@vc.net (Rich Measures)
- Date: Wed, 9 Jun 1999 23:08:49 -0700
- ? [guffaw] ? D401 appears to limit the hv neg. potential to gnd during a glitch, hopefully protecting the grid-current meter from damage. . Because there should be no RF in this part of the circuit,
- /archives//html/Amps/1999-06/msg00329.html (8,925 bytes)
- 3. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Thu, 10 Jun 1999 11:08:04 +0100
- While I agree wholeheartedly with Rich about a filament voltmeter, it's interesting that very few (if any) commercially manufacured 'amateur' amplifiers have this feature. It comes down to how much y
- /archives//html/Amps/1999-06/msg00338.html (8,378 bytes)
- 4. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: rakefet@rakefet.com (Vic Rosenthal)
- Date: Thu, 10 Jun 1999 07:22:23 -0700
- Actually I find the grid current meter very useful as an indication of the degree of loading. It's also quite easy to cause excessive grid current to flow with a 100w exciter, and it's a good warning
- /archives//html/Amps/1999-06/msg00342.html (8,419 bytes)
- 5. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: measures@vc.net (Rich Measures)
- Date: Thu, 10 Jun 1999 07:52:25 -0700
- ? A filament-voltmeter for the 3-500Z, in lieu of a grid-current meter, would have added little to the price. A 1mA DC movement would have sufficed. A schottkey rectifier costs under $0.50. The most
- /archives//html/Amps/1999-06/msg00343.html (8,900 bytes)
- 6. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: measures@vc.net (Rich Measures)
- Date: Thu, 10 Jun 1999 08:11:20 -0700
- ? However, there is no value of grid-current that tells the operator when the loading is right. When the tune and load are set for max. power out with full drive (65w), the loading is right and the
- /archives//html/Amps/1999-06/msg00347.html (9,002 bytes)
- 7. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Fri, 11 Jun 1999 09:15:33 +0100
- meter, expensive in a Agreed. But perceptions come into this too. I guess many hams wouldn't know what do with the filament rheostat; some would turn it full up to get more emission, some right down
- /archives//html/Amps/1999-06/msg00363.html (8,796 bytes)
- 8. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: measures@vc.net (Rich Measures)
- Date: Fri, 11 Jun 1999 03:37:37 -0700
- ? With a thoriated-tungsten cathode, there is virtually no increase in output if the filament potential is increased above what is needed to secure maximal PEP. The technique for adjusting filament
- /archives//html/Amps/1999-06/msg00370.html (9,843 bytes)
- 9. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: Peter_Chadwick@mitel.com (Peter Chadwick)
- Date: Fri, 11 Jun 1999 11:55:24 +0100
- and of course, old thoriated filament tubes that have 'failed' can often be restored by by this technique - sometimes, even by over volting them for a period. Well, you wouldn't really want one in th
- /archives//html/Amps/1999-06/msg00371.html (8,797 bytes)
- 10. [AMPS] Purpose of components on SB-1000 (score: 1)
- Author: measures@vc.net (Rich Measures)
- Date: Fri, 11 Jun 1999 04:24:37 -0700
- ? the discussion was about using a rheostat in the primary of the filament transformer. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/am
- /archives//html/Amps/1999-06/msg00373.html (8,542 bytes)
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