[ARC5] BC-230 Bringing back an old thead.

[David Stinson]

I understand completely, Robert.
Your are right about what the books say.
I do, however, have several of each type.
The so-called "VT-25" tubes are physically identical
to the "801s" and operate at the same neutralization
settings and power out.  The "VT-25A" tubes are physically
very different from the "801-VT25", neutralizing differently
and delivering more power.   These differences are consistant.

This is why I theorize that the tube makers tried to
cut costs by using their old "801" tooling to produce
tubes they labeled "VT-25" but which were in fact, 801s.
The books do say one thing, but opertion
in the equipment says another.
I do welcome other theories to explain this.

Respectfully,
David S.


----- Original Message ----- 
From: "WA5CAB--- via ARC5" <arc5 at mailman.qth.net>
To: <arc5 at mailman.qth.net>
Sent: Thursday, October 09, 2014 2:17 PM
Subject: Re: [ARC5] BC-230 Bringing back an old thead.


>I hate to do it but I have to disagree.  I finally found some 
>information
> on the 10Y in the obsolete tube section of RCA TT-4.  And 
> compared it to the
> 801 in TT-3 (TT-4 lists 801A but not 801).  Not only are the 
> max plate
> voltages  and plate dissipation higher for the 801 versus the 
> 10Y (600 versus 450
> and 20 versus 15), but the interelectrode capacitance is 
> different (6, 4.5,
> 1.5 versus 7, 4, 3).  TT-3 doesn't list the 10 and I still 
> haven't found
> anything listing 10 Special.  10 is shown in RCA RC-11 and 
> others but all it
> shows are Class A audio service specs, which are lower than 
> those for the
> 10Y.  The 10's Class C CW ratings if given would probably also 
> be lower than
> the 10Y.
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
> In a message dated 10/09/2014 11:22:31 AM Central Daylight 
> Time,
> arc5 at ix.netcom.com writes:
>> ----- Original Message ----- 
>> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
>> On 8 Oct 2014 at 22:48, WA5CAB--- via ARC5 wrote:
>> >
>> >>The 801 is a VT-62, not a VT-25.
>> >
>> >Isn't the VT-25 a 10?
>> I wrote about this awhile back.
>> The VT-25 is a type 801 "faked-up" with VT-25 markings.
>> VT-25*A* with the larger, longer plate are real "10 Special"
>> and are good for twice the power out in a BC-230.
>> Interchangeable in the BC-375, as Dennis said.
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: 
> http://www.qsl.net/donate.html