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

[WA5CAB at cs.com]

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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