[ARC5] VT-25 (SCR-AK-183) vs. VT-25-A (SCR-AS-183)

[Scott Robinson]

 From the Electronic Engineer's Reference Manual, published b y Nation 
Union Radio Corporation in 1944, I read

VT25 = 10
VT25A = 10Y or 10 SPEC

I'd guess that is pretty authoritative.

This is why I keep all that old paper around. Ya never know...


/scott robinson


On 3/29/16 8:05 PM, WA5CAB--- via ARC5 wrote:
> My understanding has always been that a 10 was a VT-25 and a 10 Special
> or 10Y was a VT-25-A.
>
> In a message dated 03/29/2016 14:10:03 PM Central Daylight Time,
> kk5f at earthlink.net writes:
>> Dave wrote:
>>
>> >VT25A outputs more power in this application.  More later as I can
>> >get to my notes and give you coil setting, loads and etc.
>>
>> That will be interesting.
>>
>> The change from VT-25 to VT-25-A occurred with SCR-AO-183 (Order
>> 6120-NY-41).  SCR-A*-183 manuals for models before and AFTER show no
>> change to Table III Typical Transmitter Plate and Bias Voltages for
>> the VT-25-* and VT-52 tubes.  For example, what is shown for
>> SCR-AK-183 (Order 17875-NY-39, A.R.C.) using VT-25 is identical to
>> SCR-AS-183 (Order 2534-WF-42, Philco) using VT-25-A.
>>
>> I've been unsuccessful finding data sheets for comparison of VT-25 vs.
>> VT-25-A unless one assumes that data for VT-25 are the same as those
>> for 10 or 10Y.  I do not know of any exact commercial equivalent to
>> VT-25-A, unless it be...er...10 or 10Y also.
>>
>> I should visually compare the VT-25 in my BC-187-A (SCR-178) to s
>> VT-25-A from my BC-AS-230, but both are stored away from my house
>> right now.
>>
>> Mike / KK5F
>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
>
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