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

[AKLDGUY .]

Just arrived home at 8 pm NZST after being out all day to find that Geoff
posted:

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

Thank you Geoff! That is the typical operating conditions info I wanted.

73 de Neil ZL1ANM


On Wed, Jul 9, 2014 at 9:22 AM, Geoff <geoffrey at jeremy.mv.com> wrote:

> 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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