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[AMPS] Making tubes

To: <>
Subject: [AMPS] Making tubes
From: (Peter Frenning, OZ1PIF)
Date: Fri, 6 Jul 2001 10:05:38 +0200
Hey, and nothing beats the pride of being able to say "...running 600W from
a homebrew amp..."

Vy 73 de OZ1PIF, Peter

Sound clips from OX2K operation "off the air":

**********  OZ1PIF **************
email: oz1pif(no-spam-filler)
Shack Ph. +45 4619 3208
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
----- Original Message -----
From: "Bob Marston" <>
To: "Billy Ward" <>
Cc: <>
Sent: Friday, July 06, 2001 8:18 AM
Subject: Re: [AMPS] Making tubes

> Billy Ward wrote:
> > With the high price of tubes, I was wondering if anyone invisioned a
> homebrew to actually make the tube from scratch ?
> Let me answer the last part first.  Billy the start up costs involved in
> designing and manufacturing a transmitting size tube is astronomical.
> Remember you're not dealing with a light bulb here. Some of the
> to your post have touched on the quality control aspects of manufacturing.
> The costs involved with R&D are several orders of magnitude higher. Pure
> and simple Billy there is no need to reinvent the wheel.
> There are ways to reduce the cost involved with amplifier construction.
> First what must be realized that even as expensive as Eimac tubes can be
> the bottles still only represent a fraction of the cost. For that matter
> anyone out there is looking to build a single amp with the intent of
> gobs of money over a commercial amp they are badly mistaken. If you stay
> it long enough you will find techniques to reduce costs. One that
> immediately comes to mind is to use a "pull" during the construction and
> shake out phase. Say you were to design a single 8877. A "Pull"  would set
> you back $350. If you were to suffer a parastic that blew the tube you
> would be able to recover a few shuckles of its value by selling the dud to
> Rich AG6K. Then after everything is cleaned up you could purchase a brand
> new tube.  Another hint  Always start off simple. Build a monoband triode
> amp first. For HF start out on 20 Meters. Then as you gain experience move
> to multiband and then tetrode designs. After that head to vhf and then
> cavity amps.
> And lets not forget that Russian Tubes can be obtained for 1/3 to 1/5 of
> the cost of their Eimac counterpart.
> Stay Safe and Happy Building
> 73s
> Bob K1TA
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