[ARC5] Transistorized ARC-5 Receiver

[MICHAEL ST ANGELO]

 Brian,


That's the path I took; replaced all circuitry except the frequency determining components such as the capacitors, inductors and transformers. If someone is concerned about upgrading a set with tubes there are lots of carcasses around minus the tubes to resurrect.


MPF-102's have been obsolete for years but J310 are still being produced and is a better alternative. Unfortunately the production of leaded thru-hole devices has been discontinued but SMT devices are available.


I purchased leaded J310s from Arrow Electronics last year. I checked today and they are on backorder.


I also stocked up an leaded bipolar transistors such as the 2N3904 and 2N3906 at that time.


Dan's Small Parts still has leaded devices.


With regards to plug-in replacements I would be more interested with solid state replacements for some of the transmitting tubes which are hard to find such as the 211E in the BC-375.


Mike N2MS


> 
>     On January 2, 2017 at 4:56 AM Brian <brianclarke01 at optusnet.com.au> wrote:
> 
>     Hello folks,
>     I wonder if we've gotten ourselves trapped into thinking we need to
>     replicate all functions of a tube. If you really want that kind of
>     authenticity, how are you going to build in the noise?
>     If I were to transistorise a Command set, I would replace ALL tubes, and I
>     would NOT put in resistors to simulate the heaters. That would reduce power
>     dissipation / consumption by about 12 W - one of the advantages of going SS.
>     Perhaps, Phillip, when chatting with your friend, Edward Allison, you could
>     ask him to make SS replicas without a heater resistor. Then it doesn't
>     matter whether you're relacing a tube with a 6 V, 12 V or 28 V heater.
>     For my 2 c worth, to replace all 6 tubes at US$45 a pop, is worth more than
>     the whole receiver. My suggestion would be for some of us to experiment with
>     SS replacements and then share their results here. Who has a stock of
>     MPF-102s?
>     73 de Brian, VK2GCE.
> 
> 
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