Hi I'm sure there is a more scientific ways of doing this but to me this proved a point that certain sellers cannot be trusted . Maybe there is some New old stock somewhere who knows.
@@MicroChipz So really, these days, who do you trust. Impossible to get decent components It's a Domico convoy 1 I'm trying to get working.. Mission impossible with crap trannys
These transistors are not regular rf-types, and then they differ greatly from manufacturer to manufacturer. Lock at the tester and find similar b-value (voltage gain) and similar input /output capacitances. Other types need retuning in a specific environment. Good luck.
@@MicroChipz yes from Digikay they should be safe, but yes it is always the matter of the dealer and your purchase, keep your fingers crossed that they are good, oh yes a question about Multi 3 from HAM in mine there was a yellow cable under the VCO that goes to one of the 5 Pin's was original, I don't think so, or ❓
![Gain block RF Amplifiers - Theory and Design [1/2]](/img/n.gif)
A very thorough investigation. What chance does anyone have of finding legitimate transistors, with these sort of results? Pretty slim, I'd imagine.
Hi I'm sure there is a more scientific ways of doing this but to me this proved a point that certain sellers cannot be trusted . Maybe there is some New old stock somewhere who knows.
What you are trying are audio amp transistors like the 2sc1173, produce 3 watts in a CB set but get really hot really quick.
Most probably . They went in the bin shortly after .
If you know where to purchase the real equivalents its not a problem, but genuine Mitsubishi have not been made since 2006, and are non-existent.
The new HG 1969 is a pretty good replacement part.
Who was the reputable supplier? Not little diode by any chance? Just had a set of fake 2078s from them
Cricklewood electronics
@@MicroChipz
So really, these days, who do you trust.
Impossible to get decent components
It's a Domico convoy 1 I'm trying to get working..
Mission impossible with crap trannys
These transistors are not regular rf-types, and then they differ greatly from manufacturer to manufacturer. Lock at the tester and find similar b-value (voltage gain) and similar input /output capacitances. Other types need retuning in a specific environment. Good luck.
Most of these were just rubbish that found, clearly fake .
The IRF520 from Ebay is the Same shit 🤮
Most probably , I got mine from digikey so I hope they are genuine
@@MicroChipz yes from Digikay they should be safe, but yes it is always the matter of the dealer and your purchase, keep your fingers crossed that they are good, oh yes a question about Multi 3 from HAM in mine there was a yellow cable under the VCO that goes to one of the 5 Pin's was original, I don't think so, or ❓
@@VOLKZZORNthe yellow wire is original
@@MicroChipz okthen it has to be correct again on the shortened PIN on the VCO board 😉yes now just a new VCO and I think I have 70% on the box 😉
The original Transistors of the old times are never laser engraved. They were always printed with paint.
Yes they are .
All fake