Looking at the transistors in this PTO, I'm 99.9% sure someone replaced them:
they are both marked NSRS / 2018, with the / being a line break.
I'm sort of thinking that Drake used different parts for the oscillator and
buffer for a good reason. Aside from this maddening frequency-shifting and
Steve -
I've looked in a LOT of PTOs, and I've never seen anything but a 2N3858 in the Buffer and either a
2N3858 (early) or 2N706 (late) in the oscillator. No other changes required with either oscillator
transistor. The '3858 is just about extinct, but the 2N706 is still a common
into account the need to watch for NPN, PNP,
FET, etc. configurations.
Paul, W9AC
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: Steve Wedge w1es1...@earthlink.net
Cc: drakelist@zerobeat.net
Sent: Sunday, July 24, 2011 2:45 PM
Subject: Re: [Drakelist] R-4A PTO
- Original Message - From: Garey Barrell k4...@mindspring.com
To: Steve Wedge w1es1...@earthlink.net
Cc: drakelist@zerobeat.net
Sent: Sunday, July 24, 2011 2:45 PM
Subject: Re: [Drakelist] R-4A PTO - transistors substituted?
Steve -
I've looked in a LOT of PTOs, and I've never seen
the need to watch for NPN, PNP,
FET, etc. configurations.
Paul, W9AC
- Original Message - From: Garey Barrell k4...@mindspring.com
To: Steve Wedge w1es1...@earthlink.net
Cc: drakelist@zerobeat.net
Sent: Sunday, July 24, 2011 2:45 PM
Subject: Re: [Drakelist] R-4A PTO - transistors
...@mindspring.com
mailto:k4...@mindspring.com
To: Steve Wedge w1es1...@earthlink.net
mailto:w1es1...@earthlink.net
Cc: drakelist@zerobeat.net mailto:drakelist@zerobeat.net
Sent: Sunday, July 24, 2011 2:45 PM
Subject: Re: [Drakelist] R-4A PTO - transistors
2:45 PM
Subject: Re: [Drakelist] R-4A PTO - transistors substituted?
Steve -
I've looked in a LOT of PTOs, and I've never seen anything but a 2N3858 in
the Buffer and either a 2N3858 (early) or 2N706 (late) in the oscillator.
No other changes required with either oscillator transistor
To: Steve Wedge w1es1...@earthlink.net
Cc: drakelist@zerobeat.net
Sent: Sunday, July 24, 2011 2:45 PM
Subject: Re: [Drakelist] R-4A PTO - transistors substituted?
Steve -
I've looked in a LOT of PTOs, and I've never seen anything but a 2N3858 in the Buffer and either
a 2N3858 (early) or 2N706 (late
If the above message appears, it came from Steve's Son of Laptop!
- Original Message -
From: Garey Barrell k4...@mindspring.com
To: Steve Wedge w1es1...@earthlink.net
Cc: drakelist@zerobeat.net
Sent: Sunday, July 24, 2011 6:24 PM
Subject: Re: [Drakelist] R-4A PTO - transistors substituted?
Steve
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