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Total 562 documents matching your query.

121. Re: [Amps] Can some explain this curious eBay auction (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 26 Aug 2012 04:18:06 -0400
All you need is something reasonably rare and at least two people who REALLY want them. I'd been thinking for quite a while I'd like to get an S-Line for a tube, back up rig as the prices haven't bee
/archives//html/Amps/2012-08/msg00433.html (10,665 bytes)

122. Re: [Amps] Alpha 78 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 26 Aug 2012 04:22:54 -0400
Just give it the smell test, or stick a thermocouple onto the core and keep track of the temp. Bout I'd settle for about 40C rise over room temp as good for 24 X 7. The hams on here who really know t
/archives//html/Amps/2012-08/msg00434.html (7,847 bytes)

123. Re: [Amps] Can some explain this curious eBay auction (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 26 Aug 2012 05:23:55 -0400
Or the shill, working for the seller, runs the bid up, backs out after so the sucker gets the bid. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2012-08/msg00436.html (10,036 bytes)

124. Re: [Amps] Vacuum Variable Help Needed (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 27 Aug 2012 14:34:17 -0400
My son would love to have the machine tools. Unfortunately it'd probably cost him more for trucking that what they are worth just to get them home, Then he'd have to build a place to keep them. 73 Ro
/archives//html/Amps/2012-08/msg00483.html (9,315 bytes)

125. Re: [Amps] current threads about silver solder and resoldering (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 27 Aug 2012 21:36:43 -0400
And then they learned about "Tin Whiskers!", particularly when the idea of ROHS idea came about. One TV repairman told me that the vast majority of repairs and trouble calls are mainly caused by ROHS
/archives//html/Amps/2012-08/msg00493.html (9,407 bytes)

126. Re: [Amps] current threads about silver solder and resoldering (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 01 Sep 2012 15:20:00 -0400
Most things are labeled the largest component to the smallest by weight, Yes, for example the list of chemicals in food is like that. But solder normally isn't. I think there is an ISO standard defi
/archives//html/Amps/2012-09/msg00001.html (9,062 bytes)

127. Re: [Amps] current threads about silver solder and resoldering (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 01 Sep 2012 22:38:07 -0400
Most things are labeled the largest component to the smallest by weight, Yes, for example the list of chemicals in food is like that. But solder normally isn't. I think there is an ISO standard defi
/archives//html/Amps/2012-09/msg00014.html (11,770 bytes)

128. Re: [Amps] current threads about silver solder and resoldering (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 02 Sep 2012 15:30:43 -0400
I recalled that the ratios of lead and tin atoms had to be an integer to for the lowest melting point. But that's not right either! I hate to be so overly teacherish in this thread, but facts remain
/archives//html/Amps/2012-09/msg00021.html (10,818 bytes)

129. Re: [Amps] SS Amp questions (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Sep 2012 04:00:26 -0400
They do make some handy equipment that works fairly well, they make some to a price and stretch the power out beyond reliability limits, but you only need to look at the QC on the same items built un
/archives//html/Amps/2012-09/msg00144.html (9,447 bytes)

130. Re: [Amps] Pulser (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Sep 2012 17:46:16 -0400
On 9/10/2012 4:48 PM, Edwin Karl wrote: The theory behind pulsing when tuning is to tune the radio (remember plate and tune controls) without over dissipating the finals (sweep tubes and even the alm
/archives//html/Amps/2012-09/msg00161.html (8,663 bytes)

131. Re: [Amps] MFJ products (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Sep 2012 20:46:47 -0400
You have to look at it this way, if MFJ had not bought up many of the old Ham Radio Equipment suppliers we may not find stuff at all or at reasonable price, anything that is shipped you should check
/archives//html/Amps/2012-09/msg00179.html (17,048 bytes)

132. Re: [Amps] Pulser (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Sep 2012 22:07:56 -0400
If your amp can't do full power for the few seconds needed for a tuneup, you're pushing it too hard anyway, IMO. It's not whether the amp can do a full power tune up, it's now much it drags the HV do
/archives//html/Amps/2012-09/msg00183.html (8,871 bytes)

133. Re: [Amps] MFJ products (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 10 Sep 2012 23:44:22 -0400
On 9/10/2012 10:15 PM, Glen Zook wrote: The main problem with mfj is their quality assurance. Way too many products come with missing hardware, extra hardware (probably from the last unit down the li
/archives//html/Amps/2012-09/msg00188.html (10,891 bytes)

134. Re: [Amps] AL-80B (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 03 Oct 2012 07:11:22 -0400
I wouldn't call it normal, but vibration is not uncommon in E/I transformers although it can come from things other than laminations. As Carl said, as it's still well within warranty I'd call the fac
/archives//html/Amps/2012-10/msg00011.html (7,871 bytes)

135. Re: [Amps] preserving tubes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 04 Oct 2012 19:49:13 -0400
True, but: The military used to get 4CX150s in vacuum packed cans. Lets say a tube with metal to glass seals like the 4CX150, or PL172 has an expected vacuum life of 15 years. If you have a bunch of
/archives//html/Amps/2012-10/msg00028.html (9,077 bytes)

136. Re: [Amps] preserving tubes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 05 Oct 2012 18:12:40 -0400
On 10/4/2012 7:49 PM, Roger (K8RI) wrote: On 10/4/2012 4:16 AM, ian@ifwtech.co.uk wrote: If a tube has leakage to air, it is doomed anyhow, and storing it in a vacuum can only delay the inevitable. L
/archives//html/Amps/2012-10/msg00031.html (10,224 bytes)

137. Re: [Amps] preserving tubes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 05 Oct 2012 21:17:42 -0400
Don't know, but they are pretty small cans and here size really does make a big difference! 73 Roger (K8RI) <snip> _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2012-10/msg00032.html (7,985 bytes)

138. Re: [Amps] 300 W single band mobile amp needed (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 07 Oct 2012 20:21:31 -0400
On 10/7/2012 11:24 AM, rick darwicki wrote: I have a friend that runs a motorcycle mobile on 20 Meters at about 100 watts. He is looking for a schematic/info/link for a simple no tune amp of about 30
/archives//html/Amps/2012-10/msg00051.html (9,060 bytes)

139. Re: [Amps] 300 W single band mobile amp needed (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 07 Oct 2012 22:53:11 -0400
There is no doubt it would exceed RF exposure limits (which have never been proven to be worth while and are set to several times the level considered to still be safe.) With a mobile whip efficency,
/archives//html/Amps/2012-10/msg00053.html (8,960 bytes)

140. Re: [Amps] 300 W single band mobile amp needed (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 07 Oct 2012 22:58:49 -0400
Probably not except for short transmissions. Even if so, would you want that much RF on an antenna mounted on your bike? Not me, I have an implanted defibrillator. What is the RF power output of the
/archives//html/Amps/2012-10/msg00054.html (12,277 bytes)

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