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I have been purchasing MRF477s, 2SC2312s, and 2SC1969s directly from HG semiconductor ().? I have a HTX-10 and a couple of HTX-100s that I repaired with the parts.? The parts work well and are direct drop in replacements.? The repairs have all been 10M radios, so I want to see if they work in a push-pull amp.??

I also would not mind putting together a 50 watt MRF477 push-pull amp (1995 Handbook, page 17.93).

Marco - KG5PRT

On Wed, Jan 10, 2018 at 3:15 PM, Thomas Sharka via Groups.Io <sharkatw@...> wrote:

The 2SC2312 is long out of manufacture so any "new" ones that you find on ebay will most likely be factory sweepings that were relabled. While it's possible to stress test each and every one that you purchase, there won't be a reliable run to be found.

?

But if you enjoy the thrill of finding a suitable substitute, I don't see anything wrong with the design. It's simple and straightforward. You have to be careful not to overdrive it, however as it will probably fry those finals in a very short time. Also, the max ratings on the transistor are about 17 watts each, so if you're driving a pair at 40 watts, you're going to be pushing them a bit.

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On Wednesday, January 10, 2018 3:53 PM, M Garza <mgarza896@...> wrote:

Has anyone built the FARA Amplifier?? Any thoughts on it?? It uses a pair of 2SC2312 bipolar transistors.

Here is a link for a pdf:?

I have a few HG 2SC2312s, so I am debating on ordering a couple of the board sets from FAR Circuits.? ?$18 for the 2 board set.

Marco - KG5PRT

On Wed, Jan 10, 2018 at 2:18 PM, kc0wox Leeper <kc0wox@...> wrote:

You can see a youtube video testing the wa2eby amplifier lowpass filter frequency response at It uses a HP8407a network analyzer to check the frequency response. The first part of the video explains how a network analyzer works and then tests the lowpass filters.

Leonard
kc0wox