[Amps] Alpha 76A drive levels...

[tz4am at aol.com]

Carl: 
I have a 3-holer, with so-so tubes.
On 40 meters on the SSB setting, tuning to keep grid current maximum at no higher than 0.6 on the scale and a dip in plate current, I get about 1 KW forward power; it takes about 87 watts to get this output with so-so tube.
On other bands, the same procedure yields about 850 watts with drive of between 40 and 60 watts.
Is this the right procedure for tuning or should I be doing things differently?
73,

Jeff

-----Original Message-----
From: Carl <km1h at jeremy.qozzy.com>
To: tz4am <tz4am at aol.com>; amps <amps at contesting.com>; wa6fgi <wa6fgi at steeltrails.net>
Sent: Wed, Jan 2, 2019 2:24 am
Subject: Re: [Amps] Alpha 76A drive levels...

As low as required to peak the output at 1200W, about 30-40 ma total with 
used tubes at 60W or so.

I bought this amp as a basket case, bad tubes, transformer, bandswitch, etc, 
so do not know what it did when new.

Carl



----- Original Message ----- 
From: tz4am at aol.com
To: km1h at jeremy.qozzy.com ; amps at contesting.com ; wa6fgi at steeltrails.net
Sent: Saturday, December 29, 2018 11:02 AM
Subject: Re: [Amps] Alpha 76A drive levels...


Carl,


Thanks for the information. What is the grid current reading at 1200w?


Jeff
TZ4AM



-----Original Message-----
From: Carl <km1h at jeremy.qozzy.com>
To: amps <amps at contesting.com>; Gary Smith <wa6fgi at steeltrails.net>
Sent: Sat, Dec 29, 2018 2:59 pm
Subject: Re: [Amps] Alpha 76A drive levels...


Alpha offered a low drive mod for that series of amps, check their legacy

amp docs.



My 76PA 3 holer will easily run 1800W with100W drive, I back it down for

1200W.



Carl



----- Original Message ----- 

From: "Gary Smith" <wa6fgi at steeltrails.net>

To: <amps at contesting.com>

Sent: Sunday, December 23, 2018 5:06 PM

Subject: [Amps] Alpha 76A drive levels...





> To the group:

>

> Have a friend who recently purchased a Alpha 76a two-holer.

>

> He currently is driving it about 65 watts getting 500 watts or so output.

>

> As he has no instructions on the amp, is this low level of drive okay or

> should it be driven at a higher level of input power.

>

> Thanks to the group,

>

> Gary...wa6fgi

>

> _______________________________________________

> Amps mailing list

> Amps at contesting.com

> http://lists.contesting.com/mailman/listinfo/amps





---

This email has been checked for viruses by AVG.

https://www.avg.com



_______________________________________________

Amps mailing list

Amps at contesting.com

http://lists.contesting.com/mailman/listinfo/amps