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

[Ian Wilson]

Sibley says:
"VT-25:   AKA CV603, 10.
 VT-25A: AKA 2C25, 10Y

 10Y = 10 with Micanol base; uprated to 15W, 8MHz (10 = 10W)."

10Spl appears to map to 2C25, 10Y to 2C23.
The 10Spl also appears to have been the 1602.

73, ian K3IMW


On Tue, Mar 29, 2016 at 12:09 PM, Mike Morrow <kk5f at earthlink.net> wrote:

> 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
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