Yes, indeed. But I only think of their higher power options with two or three
holes of 4cx800 tetrodes. These sorts of ceramics with their high dissipation
are where switching gets more difficult.
I still believe the number one cause of tube failure is switching. The triodes
are often doomed to fail through poor design in the control board. They are
rugged generally but will not hold up to hot switching.
That is why I found so much work with Commander.
Sorry again for too much bandwidth.
73,
Mike
W2AJI
Sent from my iPhone
> On Apr 2, 2015, at 3:22 PM, Rick - DJ0IP / NJ0IP <Rick@DJ0IP.de> wrote:
>
> Not so; QRO had the HF-1000 and HF-2000 with 1x and 2x 3-500z tubes.
> I owned both back in my serious contesting days.
>
> In fact they still sell the HF-2000.
> It is currently my favorite amp on the market.
> See: http://www.qrotec.com/
> The first amp shown uses 2x 3-500z.
>
> They have always had this amp. Discontinued the HF-1000 because the AL-80x
> made life too hard for them. Couldn't compete on price. I owned an AL-80A
> at the same time I had the pair of QROs. Simply no comparison in build
> quality, though for the price, I think the AL-80B is now the best amp going.
> BUT, you have to manage your timing with it. Its open-frame T/R relay is s
> l o w.
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mike
> Schatzberg
> Sent: Thursday, April 02, 2015 10:56 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Centaur Tubes odd ones in parallel
>
> I never use tetrodes myself and that is what QRO uses.
>
> Commander may have one of the best RF decks in the business. But their
> control board is in need of help generally particularly their switching. I
> have modified many units over the years.
>
> 73,
>
> Mike
> W2AJI
>
> Sent from my iPhone
>
>> On Apr 2, 2015, at 2:06 PM, Rick - DJ0IP / NJ0IP <Rick@DJ0IP.de> wrote:
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