[RTTY] My post on amp suggestions last week

[David G3YYD]

I agree with Jeff on the 3-500z. I have used a Heathkit SB-220 which I built
from a kit in 1972. It has been run hard in RTTY contesting/rag chewing ever
since. It still has the original pair of Eimac 3-500z and delivers full
power with no problem. There are designed to glow red in normal use. This
anode temperature is required to make the getter material, which coats the
anode, work. Getter material bonds with gas particles so keeping a good
vacuum. Under running 3-500z is not a good idea.

The EHT transformer died after years of abuse as it was never designed to
run RTTY at full power - the insulation broke down. I replaced it with an
external fan cooled toroidal transformer which just works.

One big advantage of the 3-500z is the almost instant on just a few seconds.
Great for working that DX station you absolutely need to work before he goes
QRT.

73 David G3YYD

-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Jeff AC0C
Sent: 29 May 2017 03:39
To: joeduerbusch; Richard White
Cc: RTTY, Contesting
Subject: Re: [RTTY] My post on amp suggestions last week

I would agree with Joe's recommendation.  A 3-500z beats any number of 811s
any day of the week in my book.  I have a box of 572b here (a much stouter
tube than the 811) on the shelf that died running within their specification
limits in RTTY contesting.  I suppose that the 811 will do just fine if you
are careful.  A 3-500z can take miserable abuse and still keep smiling
though.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message-----
From: joeduerbusch
Sent: Sunday, May 28, 2017 8:08 PM
To: Richard White
Cc: RTTY, Contesting
Subject: Re: [RTTY] My post on amp suggestions last week

Dick, I would suggest the AL80B instead of the 811's.  The single 3-500Z
will last a long time in RTTY use.
You can get a used AL80B for about the same price as the  811.

AA5AU uses two AL80B for rtty contesting and he is a winner most of the time

http://www.aa5au.com/rtty/articles/2004-station-renovation/

Joe K0BX

On Sun, May 28, 2017 at 9:44 PM, Richard White <whiter26 at sbcglobal.net>
wrote:

> Many thanks to all who sent me an e-mail with comments on amps. I 
> asked about the AL-811 and 811H with comments ranging from "NO to anything
811"
> to
> "I have used a 811H for RTTY at 400 watts with no trouble." Almost all 
> commented on plate voltage requirements. I have 2 radios, YAESU Mark-5 
> Field and a TEN TEC Omni-7. Looks like I will have to do some more 
> searching to decide which radio I want to use with the amp and what 
> the radio/amp requirements are best for me to use.
>
>
>
> I had several suggestions about using other modes, such as the JT's 
> Olivia and PSK31 instead of RTTY. I tried PSK31 several years ago and 
> found it boring and not suited to my contesting use. I prefer to use 
> CW and RTTY and not mess with other modes.
>
>
>
> Many thanks for all the replies and information.  Look for me in the 
> RTTY contests. Now back to the amp question for meJ
>
> 73   Dick   KS0M
>
>
>
> Richard C. "Dick" White
>
> Fulton, MO 65251 U.S.A
>
> Amateur Radio Station  KS0M
>
>
>
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