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Thanks for that.. that means my rework idea will work .. probably .. at 7mhz it is all smoke and mirrors ... I looked at the photos and even went to an online video and I would swear what I am seeing is a T39 can in the heat sink. by comparison in size with the T220 for example. Possibly some bitx40s came out with the more capable RF Power transistor (NOT a 2n3886 as per below - I got that wrong - I will check and advise the part number) and when they ran out they went back to the lightweight device.
Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,
Telephone Whangarei 022 691 8405
----- Original Message -----
Sent:Sat, 4 Aug 2018 19:37:35 -0400
Subject:Re: [BITX20] BITX40 output power at 36 volts to the IRF510 #bitx40 #bitx40help
I just looked at both of my B40s, they both have a 2N2219A (metal can)
with a heat sink attached.
Vince - K8ZW.
On 08/04/2018 07:30 PM, Timothy Fidler wrote:
> One concern that I have is
> that Farhan is publishing Q4 as a 2n2219A metal case npn but what shows
> on the photos is a T39 case RF driver.. you take my point. If the
> physical entity and the schematic do not agree it is pretty involved to
> re-engineer a physical board. I suspect that the driver is a 2N3886
> Please inspect and advise before you contact me. TEF
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/