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References: [ +from:df3kv@t-online.de: 314 ]

Total 314 documents matching your query.

41. Re: [Amps] Strange power supply (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 20 Apr 2006 03:58:25 +0200
If the voltage drop is that large and you have the loud hum it is more then likely that there will a bad diode 73 Peter _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2006-04/msg00307.html (9,932 bytes)

42. Re: [Amps] Input tuning (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 29 Apr 2006 17:46:42 +0200
Hi Rich, his intention is a grounded grid configuration. The cathode input impedance will be around 120 Ohm which will be best suited by a low Q Pi-Circuit Grid swamping would be a bad idea 73 Peter
/archives//html/Amps/2006-04/msg00435.html (7,423 bytes)

43. Re: [Amps] tank coil heating (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 12 May 2006 18:15:20 +0200
Hi Chuck, I visited your website today and had a look on you project. So far a nice job as your first amp! Connect the padder cap to the 80m switch position only, then it will be in circuit when you
/archives//html/Amps/2006-05/msg00089.html (10,455 bytes)

44. Re: [Amps] FW: Re: tank coil heating (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 16 May 2006 16:34:34 +0200
It happened here with a Command amp owner at least two times during RTTY contest and once during SSB on 40m 73 Peter ** REPLY SEPARATOR ** I think the engineers at Command were surprised to see an ap
/archives//html/Amps/2006-05/msg00130.html (7,231 bytes)

45. Re: [Amps] WLW 500 kW transmitter (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Wed, 17 May 2006 02:09:31 +0200
I do agree, At present I am in the process of refurbishing a russian military autotune amp 1,5-26MHz with GU78b. I just started with cleaning, but I already ha a look at the output network and that c
/archives//html/Amps/2006-05/msg00161.html (8,098 bytes)

46. Re: [Amps] who needs it? Henry 8K (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 19 May 2006 13:52:15 +0200
No, everybody should be allowed to use 5W into a simple dipole only. It will be not possible to have large antennas everywhere or higher power. With large antennas the signal will be the same as with
/archives//html/Amps/2006-05/msg00236.html (8,309 bytes)

47. Re: [Amps] who needs it? Henry 8K (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 19 May 2006 17:06:08 +0200
A signal usually is not getting wider by amplification, neither by amplifier nor by antenna gain You probably can not move closer then 5KHz closer to you neighbours frequency while he is running 5W 1
/archives//html/Amps/2006-05/msg00245.html (9,007 bytes)

48. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 26 May 2006 05:25:36 +0200
Hi Manny, 51pf of output capacity is very unlikely for such a small tube, it will be not more then 10-15pf for sure 73 Peter Would it be feasable to build a 4 tube amplifier using the 4cx800 russian
/archives//html/Amps/2006-05/msg00364.html (8,277 bytes)

49. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 26 May 2006 07:19:11 +0200
The tubes will do fine with 2.6KV but the problem will be to get the tubes matched to a quad, those tubes vary quite a bit. I needed 8 tubes to find 2 almost equal. To raise the C1 capacitance I woul
/archives//html/Amps/2006-05/msg00368.html (10,119 bytes)

50. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 26 May 2006 18:52:23 +0200
Hi Phil, You are claiming that two 8660 tubes drive another pair of 8660 tubes? The original posting meant eventually that the output network should be adjusted for the power to be operated and not t
/archives//html/Amps/2006-05/msg00388.html (9,805 bytes)

51. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 27 May 2006 00:02:02 +0200
Phil, The 8660 is the equivalent to the 4CX1500B, The driver tubes are 8122 I found out. Again, if I drive a 8171 to not more then 1,5KW output ever, it should be tuned for that power, not for 20KW 7
/archives//html/Amps/2006-05/msg00404.html (8,956 bytes)

52. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 27 May 2006 00:31:38 +0200
In the Harris manual of the RF110-A the driver tubes are shown as 8122 and the 8660 finals as 4CX1500B. Agreed on the tank circuit. 73 Peter Sorry for the error; 8660 is the Harris designator for the
/archives//html/Amps/2006-05/msg00406.html (8,517 bytes)

53. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 27 May 2006 15:12:44 +0200
Very true. However, if the design goal is a clean signal in class A at 1500W output only and never more, it would be a silly idea to use parts sufficient for 20KW out, like large capacitors, coils, a
/archives//html/Amps/2006-05/msg00414.html (8,944 bytes)

54. Re: [Amps] 813's (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 27 May 2006 20:19:48 +0200
Yes, you can. At least with the kind made by Valvo. Pins 2 and 6 should be vertically orientated then. 73 Peter Can anyone tell me if the 813 tube can be used safely in the horizontal position ??? ca
/archives//html/Amps/2006-05/msg00425.html (7,384 bytes)

55. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 28 May 2006 03:26:22 +0200
Right, then one probably switches to the other amp ;-)) 73 Peter _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2006-05/msg00436.html (8,714 bytes)

56. Re: [Amps] 813's (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 28 May 2006 23:32:48 +0200
Should be 270 Ohm 73 Peter Anyone know what the input impedance of the 813 might be in g-g opn.?? carl / kz5ca _______________________________________________ Amps mailing list Amps@contesting.com ht
/archives//html/Amps/2006-05/msg00458.html (7,559 bytes)

57. Re: [Amps] Replace 2x 4-400 with 2x 3-500ZG (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 2 Jun 2006 12:25:16 +0200
I usually do it the other way round as 4-400G/QB4/1100/RS1002A are more rugged then 3-500Z. You will get higher amplification, so perhaps 20% more output with the same driving power by using 3-500Z.
/archives//html/Amps/2006-06/msg00032.html (8,330 bytes)

58. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 4 Jun 2006 11:39:07 +0200
One cause of arcing could be a lost or wrong antenna. I always install spark gaps in my linears for that reason 73 Peter --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@co
/archives//html/Amps/2006-06/msg00086.html (9,745 bytes)

59. Re: [Amps] 4CX10 000J (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 2 Jul 2006 17:02:26 +0200
All the J-types are low distortion, gain of both is about 20db 73 Peter, DF3KV --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Joe Subich, W4T
/archives//html/Amps/2006-07/msg00051.html (7,837 bytes)

60. Re: [Amps] 4CX10 000J (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sun, 2 Jul 2006 18:27:18 +0200
Why not, if you don&acute;t bother the power bill you can easily achieve a super clean legal limit signal which will be much better then any ham linear. Of course it needs to be be driven by a transm
/archives//html/Amps/2006-07/msg00058.html (8,648 bytes)

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