[ARC5] Transistorized ARC-5 Receiver

[George Babits]

I've been watching this thread since it began.  Wondering the overall WHY of 
solid stating a piece of history.  Tubes just aren't that hard to find,  so 
it just doesn't make any sense at all to me.  The "tubester" filled Collins 
gear, from what I have heard, never worked as well as the same set with the 
correct tubes in it.

George W7HDL




----- Original Message ----- 
From: "Spencer Petri" <petewa5jci at gmail.com>
To: "Phillip Carpenter" <carpenterpa at tds.net>
Cc: <arc5 at mailman.qth.net>
Sent: Monday, January 02, 2017 11:32 AM
Subject: Re: [ARC5] Transistorized ARC-5 Receiver


> Years ago I converted an LM freq meter to solid state using MPF102s,
> except in the audio. It was a fairly easy conversion, the calibration
> stayed intact. The paperwork is long gone and that's all I remember
> about it except I ran it with a 9 V battery. de Pete WA5JCI
>
> On 1/2/17, Phillip Carpenter <carpenterpa at tds.net> wrote:
>> Reading and studying the Solid State Q5er article in detail shows that 
>> the
>> author, Bob Grabowski, W5TKP, built two versions. The first was 
>> experimental
>> and used first generation transistors such as 2N1639 for the mixer and 
>> 2N384
>> for the oscillator. Also the originals coils were altered. It was a fair
>> amount of work and destroyed the Command receivers original componentry.
>>
>> However, a second version did not alter any of the original coils or
>> components. Also it used FETs, namely  seven TIS34s for all the stages
>> except the detector which used two 2N1306s.
>>
>> Results were claimed to be excellent. This means we could make plug in 
>> FET
>> substitution units using octal adapters (these are available on eBay from
>> China sources for 2pcs for $10.49 shipped).
>>
>> I'm going to start with a plug in substitute for the 12K8 and see if
>> performance is notably improved.
>>
>> Phillip W4RTX
>>
>> Sent from my iPhone
>>
>>> On Jan 2, 2017, at 12:33 PM, Glen Zook <gzook at yahoo.com> wrote:
>>>
>>> Plastic 2N4416 transistors, which are, basically, the same as the 
>>> MPF-102,
>>> are still available from Mouser.
>>>
>>>
>>>
>>> Leaded J-310 are also available from Mouser for $3.47 in single 
>>> quantities
>>> and for $2.79 each in quantities of 10.  The surface mount J-310 are
>>> available for as little as $0.31 in single quantities and $0.201 (yes,
>>> $0.201) each in quantities of 10 (make for total of $2.01 for 10) again
>>> from Mouser.
>>>
>>>
>>>
>>> Glen, K9STH
>>>
>>> Website: http://k9sth.net
>>>
>>>
>>> From: MICHAEL ST ANGELO <mstangelo at comcast.net>
>>> To: Phillip Carpenter <carpenterpa at tds.net>; Brian
>>> <brianclarke01 at optusnet.com.au>; Jim Haynes <jhhaynes at earthlink.net>
>>> Cc: arc5 at mailman.qth.net
>>> Sent: Monday, January 2, 2017 10:17 AM
>>> Subject: Re: [ARC5] Transistorized ARC-5 Receiver
>>>
>>>  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.
>>>
>>>
>>
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