Hi Howard
That was a very common tube in Philips radio/TV transmitters in Sweden so
they were quite common here also.
Philips name is QBL5-3500. The tube is also known as 6076.
Here is some info: http://www.tube.be/6076.html
A few Swedish hams are using that tube type in a G2DAF circuit for the HF
bands. On air, as well as spectrum analyzer tests says it's quite clean.
I have some drawings I can scan and send to you if you are interested.
My own experience with the tube is so far in a 2m amp.
73 // Einar // SM3MXR
Howard Aspinall wrote:
> Does anyone on the list have experience of using the QY5-3000A tetrode,
> originally made for VHF television service. This old Mullard product might
> not have surfaced much outside the UK, though there may be some US or other
> equivalent. I would like to exchange notes with anyone who has tried one in
> an hf amp.
>
> Howard Aspinall G3RXH
>
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