[Amps] QRO HF-2500DX

[2]

>Couple of questions concerning the QRO amp. I need a good amp capable of 
>running SSB and AM.
> From what I have read, this amp seems to be well built with a couple of 
>questions. The amp uses a 4 to 1 "transformer" in the output. I guess its 
>really a balun. 

€  A 4:1 balun allows the Pi-network tank to be designed for 200‡ output, 
and thus use a smaller amount of Load-C than would be needed for a 50‡ 
output design.  However, the tradeoff is that, for 1600w-pep, the Load-C 
would see 800v-pk instead 400v (for 50‡)

>Im not a big fan of baluns so Im a little hesitant about 
>this especially using the amp on AM. I wonder why QRO uses this balun. 
>Second question is can the 4CX800A/GU74b be considered a rugged enough tube 
>to handle AM service. And finally what is the overall opinion of this amp.
>Thanks in advance,
>
>Bill Russell
>KC2IFR
>
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>


-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
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