[ARC5] Transistorized ARC-5 Receiver

[Bill Cromwell]

Hi Brian,

I have quite few of the 102s and an assortment of similar "popcorn" 
FETs. I intend to 'go there'. New, leaded, 'through-hole' devices are 
readily available. I have no plans to build in the noise AND I will 
ignore the heater strings. I don't care that mine won't resemble the 
tubes they are replacing. My project will be a lot more pragmatic. As 
you have said, those are two of the big drivers to use solid state 
devices. Another good reason to switch to SS is the ever-dwindling tube 
supply. They are not gone yet but we are seeing some of the prices rise 
sharply due to a smaller supply. Most of them are not being made any 
more. Devices that will plug in where tubes have been living will allow 
us to 'restore' by simply replacing the soild state tube modules with 
actual tubes is desired. On the other hand, radio - as we have known it 
- seems to fading too. Let's enjoy it whatever way we can and want to 
while *we* are still here.

I have a copy of the PDF file from Wayne and I will be using it as a 
starting place. If there is other information that will help I would 
like a copy and/or a URL where I can find. I am a library patron and 
ISBN numbers can get me a copy of any book on loan - another place I am 
unafraid to go.

Happy New Year to all and...

73,

Bill  KU8H

On 01/02/2017 04:56 AM, Brian 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.
>
> On Monday, January 02, 2017 8:16 AM , you said to Jim Haynes:
>
> Jim,
>
> I'll ask him if he were to develop a SS tube replacement if he puts a 
> resistor in there for the filament.
>
> My guess is that the plug in SS tube replacement simulates the tube 
> functions nearly exactly.
>
> Phillip W4RTX
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-- 
bark less - wag more