[NJARC] Knight KX-60 Amplifier

[Al Klase]

Chuck,

Mike's analysis has been spot on.  In this particular circuit, silicon 
should work just fine, that's not always the case.

In the mean time I dug through my Germanium power box, and will bring 
some PNP TO-3 along to the meeting.

Mike, can you take a SWAG at the required HFE (gain).  I'm thing 10 
would be sufficient.

Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 6/10/2016 12:35 PM, Mike Feher wrote:
> Chuck -
>
> Even without going downstairs, which I try to avoid nowadays, I found some
> 2N4398s by Motorola that are NOS. These are TO-3 PNPs but silicon. I am sure
> they will work just fine in that circuit. You can pick them up, or, I can
> mail them to you. Here is the data sheet. 73 - Mike
>
> http://www.nteinc.com/specs/original/2N4398_99.pdf
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
> -----Original Message-----
> From: Chuck [mailto:cpaci1 at verizon.net]
> Sent: Friday, June 10, 2016 11:09 AM
> To: Mike Feher; 'Al Klase'; njarc at mailman.qth.net
> Subject: Re: [NJARC] Knight KX-60 Amplifier
>
> Thank you Mike.
> You have been a great help!
> And -- I would be more than happy to pay for those transistors.
> See you tonight at the meeting.
> Thanks again!!!!!!!
> Chuck
>
> -----Original Message-----
> From: Mike Feher
> Sent: Friday, June 10, 2016 10:57 AM
> To: 'Chuck' ; 'Al Klase' ; njarc at mailman.qth.net
> Subject: RE: [NJARC] Knight KX-60 Amplifier
>
> If I find a couple you can have them. I just have to go downstairs and
> check, but, I know I have them. They are really not that critical as the
> voltages on all three junctions is essentially the same. Your only real
> criteria is that they be PNP in a TO-3 style package. Even NPNs would work,
> but would require some circuit topology of the PS to change. Even silicon
> will work, giving you a few tenths of a volt less out. Will let you know as
> I have thousands. 73 - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
> -----Original Message-----
> From: Chuck [mailto:cpaci1 at verizon.net]
> Sent: Friday, June 10, 2016 10:09 AM
> To: Mike Feher; 'Al Klase'; njarc at mailman.qth.net
> Subject: Re: [NJARC] Knight KX-60 Amplifier
>
> Hi Mike,
> That sounds very plausible.
> My experience with solid state is fairly limited and this power supply
> circuit design is new to me.
> If you do find a couple transistors that will work, I will buy them from
> you.
>
> Thanks Mike...
> Chuck
>
> -----Original Message-----
> From: Mike Feher
> Sent: Friday, June 10, 2016 7:16 AM
> To: 'Chuck' ; 'Al Klase' ; njarc at mailman.qth.net
> Subject: RE: [NJARC] Knight KX-60 Amplifier
>
> Chuck -
>
> I believe on this case the transistors are acting as C multipliers using the
> Miller effect. The diodes are doing the rectification. I have lots of PNP
> power Ge transistors. 73 - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
> -----Original Message-----
> From: NJARC [mailto:njarc-bounces at mailman.qth.net] On Behalf Of Chuck
> Sent: Friday, June 10, 2016 4:40 AM
> To: Al Klase; njarc at mailman.qth.net
> Subject: Re: [NJARC] Knight KX-60 Amplifier
>
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
>