[ARC5] SCR-183/-283 4-5 MC Coil on 75 MTRs

[Geoff]

http://frank.pocnet.net/sheets/049/1/1626.pdf




----- Original Message ----- 
From: "AKLDGUY ." <neilb0627 at gmail.com>
To: "Mike Everette" <radiocompass at yahoo.com>; "ARC-5 List" 
<arc5 at mailman.qth.net>
Sent: Tuesday, July 08, 2014 5:19 PM
Subject: Re: [ARC5] SCR-183/-283 4-5 MC Coil on 75 MTRs


>> I think there is an early RCA tube manual, probably from circa 1940,
> either on BAMA or on the "Boatanchor Pix" web site.
>>
>> Not sure if it contains the 1626, but does have the 6J5 and 12J5.
>
> Thank you. The thing is, the 1626 is rated as a Class-C
> oscillator-amplifier, good to 30 MHz. That's why it appears in the RCA
> Transmitting Tube manual.
>
> I guess the manual didn't give typical operating conditions because
> everything is fine so long as none of the maximum CCS ratings are exceeded
> - plate voltage (250), plate current (25mA), and plate dissipation 
> (6.25W).
>
> So for an oscillator or amplifier, you find the self-bias or fixed-bias
> setting at which neither of the latter two parameters are exceeded. 
> Perhaps
> it's that simple.
>
> 73 de Neil ZL1ANM
>
>
> On Wed, Jul 9, 2014 at 9:03 AM, Mike Everette <radiocompass at yahoo.com>
> wrote:
>
>> I think there is an early RCA tube manual, probably from circa 1940,
>> either on BAMA or on the "Boatanchor Pix" web site.
>>
>> Not sure if it contains the 1626, but does have the 6J5 and 12J5.
>>
>> 73
>>
>> Mike
>> WA4DLF
>> --------------------------------------------
>> On Tue, 7/8/14, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:
>>
>>  Subject: Re: [ARC5] SCR-183/-283 4-5 MC Coil on 75 MTRs
>>  To: "AKLDGUY ." <neilb0627 at gmail.com>, "ARC-5 List" 
>> <arc5 at mailman.qth.net
>> >
>>  Date: Tuesday, July 8, 2014, 8:59 AM
>>
>>  Hello Neil,
>>
>>  Sorry I can't be more specific. I have exactly the same RCA
>>  Tx tube book. I looked in the RCA Rx tube book and there's
>>  no info about the 6J5 or the 12J5 - but mine is a relatively
>>  recent edition. I do have older editions in the ceiling, but
>>  that's a difficult job. My Philips Miniwatt valve data book
>>  is no more helpful. The only other source I have is the
>>  5-volume set of the RCA tube handbook that I picked up at a
>>  swapmeet in California; unfortunately, it must have been
>>  'dropped' at some time because all the pages are out of
>>  order - putting it back in order is on my To Do list.
>>
>>  My only other suggestion is to put the 1626 on a valve
>>  tester, vary the plate Voltage and the grid Voltage and plot
>>  actual plate characteristics. Then draw your Class C load
>>  line.
>>
>>  73 de Brian, VK2GCE.
>>
>>  On Tuesday, July 08, 2014 9:59 PM, you said:
>>    > Look up the operating data and the plate
>>  characteristics for a 12J5. Then do the calculations for
>>  Class C.
>>    >
>>    > 73 de Brian, VK2GCE.
>>
>>
>>    Thank you Brian.
>>
>>
>>    I think I can actually do better than that. I have
>>  the RCA Transmitting Tubes manual for 1956 (price one
>>  dollar!) and it lists the maximum CCS ratings for the 1626
>>  when used as RF Power Amplifier and Oscillator - Class C.
>>
>>
>>    Unfortunately it doesn't give typical operating
>>  conditions, hence my questions about plate current and bias
>>  resistor.
>>
>>
>>    Max plate voltage, current, and dissipation are 250V,
>>  25mA, and 6.25W. I think I could probably run it at 5W and
>>  get between 3 and 4 watts out of it.
>>
>>
>>    73 de Neil ZL1ANM
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