[NJARC] Knight KX-60 Amplifier

[Rich]

Sounds good. Hope it works out for you.

Rich

--------------------------------------------------
From: "Chuck" <cpaci1 at verizon.net>
Sent: Friday, June 10, 2016 11:45 PM
To: "Rich" <rjlfirst at msn.com>; "Mike Feher" <n4fs at eozinc.com>; 
<njarc at mailman.qth.net>; "Al Klase" <ark at ar88.net>
Subject: Re: [NJARC] Knight KX-60 Amplifier

> Hi Rich,
> I think I got the right type from Al tonight at the meeting.
> I'm going to give that a try tomorrow.
> I'll let everyone know if it works...
>
> Thanks for the heads-up Rich!
>
> Chuck
>
>
> -----Original Message----- 
> From: Rich
> Sent: Friday, June 10, 2016 9:04 PM
> To: Mike Feher ; 'Chuck' ; njarc at mailman.qth.net ; Al Klase
> Subject: Re: [NJARC] Knight KX-60 Amplifier
>
> Hi guys,
>
> I use to repair those old transistor car radios and just wanted to say 
> that
> as you know most used Ge PNP power transistors. Substituting a silicon PNP
> will usually result in cross-over distortion due to the difference in the
> base-emitter bias voltage.  Give it a try, it will not cause any damage,
> just a good possibility of distortion.
>
> Good Luck with it,
> Rich L.
>
> --------------------------------------------------
> From: "Al Klase" <ark at ar88.net>
> Sent: Friday, June 10, 2016 1:34 PM
> To: "Mike Feher" <n4fs at eozinc.com>; "'Chuck'" <cpaci1 at verizon.net>;
> <njarc at mailman.qth.net>
> Subject: Re: [NJARC] Knight KX-60 Amplifier
>
>> Just remember
>> Reply = Poster
>> Reply All = Everyone
>>
>> _________________________________________________________
>> 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
>>>
>>> _________________________________________________________
>>>
>>
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>
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