On Tue, 2009-10-06 at 21:31 +0100, Gordon Gibson wrote:
> Hi Guys
>
> I have had a problem on my Omni VI PA board I lost the driver transistors
> (2SC1969) Q1 & Q2, I had to replace the bias regulator components for the
> drivers LM825 & MJE520 all of which I have now replaced
>
> However we have a problem in the UK of getting Bona Fida 2SC1969's I bought
> 2 lots of so called Genuine Mitsubishi Transistors that proved to be fakes
>
> I now have found some unmarked transistors from Grandata which work great at
> LF but fall off rapidly I get the full 100w on 80m but only 20w by the time
> I get up to 20m and only 5W on 10m
>
> I am told that the 2SC1969 is obsolete and that the replacement is an
> ERF2030 which is supposed to be a direct mechanical substitute but not
> electrical
RF parts has some applications notes on using ERF2030 in some 10m/11m
radios, but not in pairs.
>
> Firstly,has anyone in the group had experience of these ERF2030's and if so
> what changes need to be made to get them to work
>
> I have found a source for them in the UK but its the same firm that sold me
> the fake 2SC1969's
>
> Secondly are there any other devices out there I can use. looking for
> suggestions
>
> 73 de Gordon G3ZFZ
>
>
73, Jerry, K0CQ
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