I am also planning to purchase an amplifier before the end of the month.
I've decided on the the QRO HF2500DX for some of the reasons outlined here
and because of the quality and economy of the Svetlana 4CX800 tubes. I've
seen too many quality and warranty issues brought up about the essentially
competing 91B to be insterested. Be advised that the QRO amp will suffer
a price increase 7/1.
-- W8KX
>
> Like Brian Short KE7GH I plan to buy a PA and I have similar goals of
> 1. Reliability
> 2. Reliability
> 3. Conservative design
> 4. Meaningful performance, not esoteric details
> 5. Quiet
>
> At Dayton, I traveled back and forth between the Alpha and QRO booths,
> comparing the construction of the Alpha 89 and QRO HF-2500DX. My
> observations:
> 1. Alpha 89 has more fault detection and protection
> 2. Alpha is more widely accepted and has a good reputation
> 3. HF-2500DX appears more conservative design
> 4. HF-2500DX uses Peter Dahl HV and filament xfmrs which alone weigh
> more than the entire Alpha 89.
> 5. HF-2500DX uses much heavier bandswitch
> 6. HF-2500DX tune & load caps have about twice the plate spacing of
> the caps in the Alpha 89.
> 7. HF-2500DX has a two-speed fan switch
> 8. The Alpha looks "shoehorned" while the QRO has working space inside
>
--
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