[Amps] Amps Digest, Vol 105, Issue 6

[Gene May]

1.  You may mean 1.2 AMPS, not ma, plate current.  However, DC input power of 1.2 amps plate current at 2800 V is 3.36 kw, not 2.45 kw.
 
2.  I don't think 45% efficiency is bad for an AB2 amplifer at 50 MHz.
 
3.  Operating parameters are a function of tube design, and so are "individual" for the tube and application.  They are chosen to achieve a desired load, efficiency and distortion level.
 
Gene May WB8WKU
 


> 
> Today's Topics:
> 
> 1.  . . . . .
> 2.  . . . . .
> 3.  . . . . . . ..
> 4. mfj 259 (Carey Lockhart)
> 5. . . . .
> 6.  . . . . . . . . 
> 
> ----------------------------------------------------------------------
>  
> Message: 4
> Date: Fri, 9 Sep 2011 06:25:10 -0500
> From: Carey Lockhart <kc5gtt at gmail.com>
> Subject: [Amps] mfj 259
> To: amps at contesting.com
> Message-ID: <156B59D5-C81D-4473-BAE3-8C8ADF4E161B at gmail.com>
> Content-Type: text/plain; charset=us-ascii
> 
> good morning guys,
> 
> i have a 6 meter project going with a gs-35. i would like to use my mfj259 on the anode and cathode. i have read all i can find as usual but still don't understand how they come up with the beginning operating parameters. really the only known one i have is plate voltage of 2800v. 
> 
> my current output is:
> 
> 2450 full load
> 80w drive
> 1.2ma plate
> 126ma grid
> 1000 out 
> 
> this does not seem to be right nor very efficient. since i have learned from yall how to calculate efficency my life has been hell. HIHI 30 to 45 percent just isn't enough. 
> 
> Carey, kc5gtt
> 
> ------------------------------
> 
> End of Amps Digest, Vol 105, Issue 6
> ************************************