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From: "Bill Turner" <dezrat@outlook.com>
Sent: Friday, January 23, 2015 9:06 PM
To: "Amps group" <amps@contesting.com>
Subject: Re: [Amps] 5 Minutes for Ameritron 811H to warm up?
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Sat, 24 Jan 2015 10:40:33 +1030, Leigh wrote:
Consequently a matched pair or quad set of reputable brand vintage NOS
811A
/ 572B tubes are worth their weight in gold....and highly sought after.
REPLY:
It bothers me to see hams wasting their time and money on tubes made
of glass. This is an obsolete technology which is of historical
interest but really has no place with modern amateur radio.
Ceramic tubes are far superior to glass, period. Yes, they are more
expensive but so what? Good stuff costs more. Always has and always
will.
Please do yourself a favor. Save your nickels and dimes, get a second
job, mow lawns or do whatever it takes but get something that works
great and if not abused, lasts essentially forever.
Ceramic is your friend.
Bill W6WRT
There are likely more ceramic tubes out there that are as bad and worse than
a lot of Chinese glass tubes.
OTOH there are plenty low cost USA made glass tubes that provide a decent
SSB signal in GG.
4-125A, 4-250A, 4-400A, 4-500A, PL-175, 813, 803, 5-400A, plus similar
European and Russian clones or originals.
My 1986 date code Eimac 3-500Z's havent shown any loss of power or gas since
new and that's been a lot of hard use.
A little research will pull out a few more along with circuits and parts
lists.
All Ive listed are rugged and not prone to easy damage by normal mistuning
or wrong bandswitch/antenna selection, as are the so called "lasts
essentially forever" ceramic versions. Indirectly heated ceramic tubes also
have a comparatively short useful life.
Just the external circuitry to completely protect an 8877, 3CX800A7,
4CX1000A and 4CX1500B plus their Chinese FU counterparts are just a few
examples of what is in currently produced amps. Several require expensive
sockets plus forced air cooling instead of a simple fan.
Just food for thought.
Carl
KM1H
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