[ARC5] ARC5 Digest, Vol 132, Issue 12

Tue Jan 6 16:10:17 EST 2015

The VT25 shown is a prewar British Air Ministry type, see 
http://www.r-type.org/exhib/aaj0063.htm

VT stands for 'Valve, Transmitting', there was also a whole sequence 
starting VR for 'Valve, Receiving'.

10E/7312 is the Air Ministry Stores Reference number

The base is not an adaptor, it is an L4 base.

Andy

----- Original Message ----- 
From: <arc5-request at mailman.qth.net>
To: <arc5 at mailman.qth.net>
Sent: Tuesday, January 06, 2015 4:51 PM
Subject: ARC5 Digest, Vol 132, Issue 12

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> Today's Topics:
>
>   1. VT25? (AKLDGUY .)
>   2. F-194/U F-195/U filters (Robert  Eleazer)
>   3. Re: F-194/U F-195/U filters (Glen Zook via ARC5)
>   4. Re: VT25? (Jim Haynes)
>   5. 8643 Tubes (Robert  Eleazer)
>   6. Re: 8643 Tubes (Glen Zook via ARC5)
>   7. Re: 8643 Tubes (David Stinson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 6 Jan 2015 22:11:16 +1300
> From: "AKLDGUY ." <neilb0627 at gmail.com>
> To: ARC-5 List <arc5 at mailman.qth.net>
> Subject: [ARC5] VT25?
> Message-ID:
> <CAETC+7PRAP8McMHFg0t6j=O8Ud-3qSg3-iEPS99p0fPeekH4nw at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> These tubes are listed for sale as VT25.
> Has anyone seen bases on VT25s like these?
> Are they some kind of adaptor?
>
> https://www.flickr.com/photos/60939566@N02/16212677985/
>
> 73 de Neil ZL1ANM
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 6 Jan 2015 09:03:15 -0500
> From: "Robert  Eleazer" <releazer at earthlink.net>
> To: <arc5 at mailman.qth.net>
> Subject: [ARC5] F-194/U F-195/U filters
> Message-ID: <15022AD447614F12BDB96BD54B040C91 at DH26DQ31>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Fair Radio has the F-196 filter for sale.  Size is given and they have 
> picture.  I would assume the F-194 and F-195 are not too different from 
> the F-196 in that respect.
>
> Wayne
>
> ------------------------------
>
> Message: 3
> Date: Tue, 6 Jan 2015 15:46:29 +0000 (UTC)
> From: Glen Zook via ARC5 <arc5 at mailman.qth.net>
> To: "WA5CAB at cs.com" <WA5CAB at cs.com>, "arc5 at mailman.qth.net"
> <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] F-194/U F-195/U filters
> Message-ID:
> <1472343253.5273793.1420559189590.JavaMail.yahoo at jws10661.mail.bf1.yahoo.com>
>
> Content-Type: text/plain; charset=UTF-8
>
> I have several of the F-195/U filters, which I have had for decades! ?What 
> I am trying to determine is if the F-195/U filters can be modified, or 
> rebuilt, to work as F-194/U. ?I know the lengths of the elements are 
> different. ?The frequency calibration for both the F-194/U and F-195/U are 
> present on the tuning knobs and if the length of the F-195/U can be 
> increased to that of the F-194/U, the calibration should work out for the 
> filter.
> Basically, I am needing the information on the length of the elements of 
> the F-194/U. ?Then, I have several options as to how to physically 
> accomplish the process including replacing the outer shell with longer 
> tubing, adding to the length with sheet metal, etc.
> The idea is to be able to use the filters in the 2-meter band.?Glen, K9STH
>
> Website: http://k9sth.net
>      From: WA5CAB--- via ARC5 <arc5 at mailman.qth.net>
> To: arc5 at mailman.qth.net
> Sent: Tuesday, January 6, 2015 1:55 AM
> Subject: Re: [ARC5] F-194/U F-195/U filters
>
> I have TM 11-487 on AN/TRC-24 (et al) scanned but you probably don't want
> to buy a copy as besides 400+ A-size pages, it contains 54 B-size and 2 
> very
> wide foldouts.? I haven't found the rated frequency operating ranges but
> after about an hour of searching, I finally came across the calibration 
> test
> specs which give the low and high test frequencies for each of the filters 
> for
> calibration test and attenuation/throughput test.? I won't attempt to
> explain the test procedures but will merely say that F-194/U covers 2 
> Meters and
> F-195/U covers the high-band VHF Commercial band.? The? filters were used
> with both the receiver and the transmitter of AN/TRC-24.? The transmitter 
> runs
> a single 4X150A in the output stage and appears to have a rated output of
> 120 Watts at 2 meters.
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 6 Jan 2015 09:51:06 -0600 (CST)
> From: Jim Haynes <jhhaynes at earthlink.net>
> To: "AKLDGUY ." <neilb0627 at gmail.com>
> Cc: ARC-5 List <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] VT25?
> Message-ID: <alpine.LFD.2.11.1501060950130.1759 at localhost>
> Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
>
> I would guess that more than one manufacturer, or country, or military
> service, decided it would be nice to designate tubes with VT followed
> by a number.
>
> jhhaynes at earthlink dot net
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 6 Jan 2015 11:24:15 -0500
> From: "Robert  Eleazer" <releazer at earthlink.net>
> To: <arc5 at mailman.qth.net>
> Subject: [ARC5] 8643 Tubes
> Message-ID: <1389699DA88748FF9DAA39E300FFCC08 at DH26DQ31>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I picked up a couple of what appear to be NOS condition 8643 tubes.
>
> Anyone know what they are good for?
>
> Wayne
>
> ------------------------------
>
> Message: 6
> Date: Tue, 6 Jan 2015 16:47:33 +0000 (UTC)
> From: Glen Zook via ARC5 <arc5 at mailman.qth.net>
> To: Robert Eleazer <releazer at earthlink.net>, "arc5 at mailman.qth.net"
> <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] 8643 Tubes
> Message-ID:
> <345294088.5314885.1420562854050.JavaMail.yahoo at jws10685.mail.bf1.yahoo.com>
>
> Content-Type: text/plain; charset=UTF-8
>
> They are the next step up from the 5894 which is a step up from the 829B 
> which is a step up from the 6907 which is a step up from the 832A. 
> ?Excellent VHF and UHF amplifier tube and work very for HF.
> Motorola used them in the MHT Motrac VHF and UHF mobile and base stations 
> as the final amplifier.?Glen, K9STH
>
> Website: http://k9sth.net
>      From: Robert Eleazer <releazer at earthlink.net>
> To: arc5 at mailman.qth.net
> Sent: Tuesday, January 6, 2015 10:24 AM
> Subject: [ARC5] 8643 Tubes
>
> I picked up a couple of what appear to be NOS condition 8643 tubes.
>
> Anyone know what they are good for?
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Tue, 6 Jan 2015 10:50:55 -0600
> From: "David Stinson" <arc5 at ix.netcom.com>
> To: <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] 8643 Tubes
> Message-ID: <0A982B2613264E879227FE74D93F689A at DaddyPC>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>
>
>>I picked up a couple of what appear to be NOS condition 8643
>>tubes.
>> Anyone know what they are good for?
>
> Fishing bobbers!
>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> ------------------------------
>
> End of ARC5 Digest, Vol 132, Issue 12
> *************************************
> 