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References: [ +from:gzook@yahoo.com: 192 ]

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1. [Amps] Hallicrafters HT-33A (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Sun, 21 Sep 2008 08:18:41 -0700 (PDT)
Within the past week I have acquired a Hallicrafters HT-33A and am in the process of restoring it. The amplifier is missing the bottom plate. Now fabricating a new plate is no problem, but I would li
/archives//html/Amps/2008-09/msg00183.html (7,743 bytes)

2. [Amps] Vaccum variables for trade (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Sun, 21 Sep 2008 08:24:06 -0700 (PDT)
I have a pair of Jennings vacuum variables in excellent condition that I would like to trade. These are 20 pf to 500 pf variables at a rating of 15 kV. The model number is CVDD-500-15N613. The only t
/archives//html/Amps/2008-09/msg00184.html (6,753 bytes)

3. Re: [Amps] 1/4" shaft connectors (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Fri, 26 Sep 2008 19:54:34 -0700 (PDT)
Frankly, you can make you own couplers for just a few cents each from copper tubing that has an inside diameter of 1/4 inch. Cut off a length about 1 inch long and then drill a hole near each end. Th
/archives//html/Amps/2008-09/msg00223.html (8,846 bytes)

4. Re: [Amps] Heathkit Warrior High Plate Curent (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Sun, 2 Nov 2008 14:39:30 -0800 (PST)
Have you verified that the meter shunt resistor is fine? The resistors in the HA-10 Warrior tend to go high in value and a high value in the shunt resistor will result in a much higher meter reading.
/archives//html/Amps/2008-11/msg00011.html (9,272 bytes)

5. Re: [Amps] SB-200/572B issues (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 12 Nov 2008 07:21:06 -0800 (PST)
Why do you consider this to be an anonymous post? The poster's call is N1MIW as is indicated by the E-Mail address. That contains considerably more information than something like bob12345@aol.com wh
/archives//html/Amps/2008-11/msg00122.html (8,462 bytes)

6. Re: [Amps] Non Detergent motor oil for dummy loads????? (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Fri, 5 Dec 2008 15:46:55 -0800 (PST)
You can get mineral oil by the gallon at just about any farm and ranch store. A gallon there is usually cheaper than a pint at a drug store. Also, you might try going by your local electric company's
/archives//html/Amps/2008-12/msg00115.html (9,132 bytes)

7. Re: [Amps] amp p/s metering (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 17 Dec 2008 18:17:02 -0800 (PST)
For accuracy I definitely would use some 1% to 5% resistors in a separate multiplier string. Use considerably higher values in the multiplier string so that they don't act as bleeder resistors. Using
/archives//html/Amps/2008-12/msg00250.html (7,894 bytes)

8. Re: [Amps] HV wire (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Mon, 22 Dec 2008 07:50:19 -0800 (PST)
Remove the shield from some solid core RG8/U or RG213/U coax. I have seen several commercial (i.e. "sputtering") linears that use this for the HV lines. It seems to work very well. Now you do not wan
/archives//html/Amps/2008-12/msg00283.html (7,755 bytes)

9. [Amps] Parts for 3-500Z amplifier (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Sat, 17 Jan 2009 08:02:22 -0800 (PST)
I am in the process of designing/building a single 3-500Z amplifier for 160 meters only (I have several linears that work on 80 through 10 meters). What I need is a filament transformer (5.0 volts ce
/archives//html/Amps/2009-01/msg00142.html (7,204 bytes)

10. Re: [Amps] SB-220 Drive Levels (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Thu, 22 Jan 2009 15:35:51 -0800 (PST)
You are thinking of the SB-200 and not the SB-220. The SB-200 (pair of 572B tubes) was rated at 1200 watts PEP input and they generally get about 600 to 650 watts output. The SB-220 (pair of 3-500Z t
/archives//html/Amps/2009-01/msg00250.html (8,389 bytes)

11. Re: [Amps] Glitch Resistor (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Mon, 2 Feb 2009 08:18:31 -0800 (PST)
In most editions of the ARRL Amateur Radio Operator's Handbook there is a chart that lists the resistance (usually per 1000 feet) of copper wire. To create a resistor you just use this information to
/archives//html/Amps/2009-02/msg00023.html (8,591 bytes)

12. Re: [Amps] RF ? (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 4 Feb 2009 07:16:06 -0800 (PST)
Try ferrite on the power cord and/or some bypass capacitors. What you are seeing is pretty common and can often occur even when much lower power is run. Many alarm systems in houses are often affecte
/archives//html/Amps/2009-02/msg00068.html (7,751 bytes)

13. Re: [Amps] power and db (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 4 Feb 2009 09:36:49 -0800 (PST)
Using the "olde tyme" figure of 1 "S" unit = 6 dB your figures are correct. Unfortunately, on many "modern" transceiver "S" meters that 3 dB increase in power can equate to several "S" units. A while
/archives//html/Amps/2009-02/msg00078.html (8,991 bytes)

14. Re: [Amps] pole transformer (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Thu, 5 Feb 2009 14:08:22 -0800 (PST)
When people have provided petitions to ban this substance based on the various hazards it has been very easy to obtain a very large number of signatures. Glen, K9STH Website: http://k9sth.com _______
/archives//html/Amps/2009-02/msg00133.html (12,453 bytes)

15. [Amps] Dual tetrode in grounded grid (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 11 Feb 2009 10:44:00 -0800 (PST)
Although not a "high powered" amplifier I am thinking of trying to use a 5894 (dual tetrode that is the next step up from the 829B) in grounded grid rather than the "normal" grid driven configuration
/archives//html/Amps/2009-02/msg00324.html (8,441 bytes)

16. Re: [Amps] Dual tetrode in grounded grid (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 11 Feb 2009 12:16:46 -0800 (PST)
Using an attenuator pad at the input is what I was considering. Of course I would rather use the power from the transmitting converter for something other than generating heat. Basically I was seeing
/archives//html/Amps/2009-02/msg00331.html (9,612 bytes)

17. Re: [Amps] Dual tetrode in grounded grid (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Wed, 11 Feb 2009 12:26:20 -0800 (PST)
I had forgotten about the beam forming plates! Just like the 1625 versus the 837 although some brands of the 1625 had the beam forming plates connected outside of the glass envelope and therefore can
/archives//html/Amps/2009-02/msg00332.html (9,086 bytes)

18. Re: [Amps] 1625 (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Thu, 12 Feb 2009 09:00:21 -0800 (PST)
The P&H 400 series amplifiers could be ordered with either modified 1625 tubes or 837 tubes. The "Four In Line" was the ARRL's version of the grounded grid amplifiers using 1625 tubes. That amplifier
/archives//html/Amps/2009-02/msg00361.html (7,987 bytes)

19. Re: [Amps] Dual tetrode in grounded grid (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Thu, 12 Feb 2009 09:06:16 -0800 (PST)
A couple of others pointed out the common cathode problem to me in direct E-Mails as well as the beam forming plates. As such, back to the original push-pull design! Glen, K9STH Website: http://k9sth
/archives//html/Amps/2009-02/msg00362.html (7,480 bytes)

20. Re: [Amps] 1625 (score: 1)
Author: Glen Zook <gzook@yahoo.com>
Date: Thu, 12 Feb 2009 09:30:46 -0800 (PST)
I pulled my original SSB Manual and you are correct, the original "Four In Line" was grid driven. There was an article in QST in the late 1950s or early 1960s that told how to convert this linear (or
/archives//html/Amps/2009-02/msg00367.html (8,282 bytes)

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