22 Apr
1999
22 Apr
'99
1:44 p.m.
On 21 Apr 99 at 20:38, Tony Duell wrote:
Thanks Tony. A good reference to keep with my old radio manuals.
I have a book with some Euro equivalents but this is good for
recognizing the odd UK one that shows up here.
ciao larry
lwalker(a)interlog.com
Let us know of your upcoming computer events for our Events Page.
t3c(a)xoommail.com
Collectors List and info http://members.xoom.com/T3C
Oh, the
expression is definitely american. The AA5 were the 12ba6, 12be6,
35w4, 50b5 and the 12at6. British and Euro names for the same tubes could be
The European (strictly Philips/Mullard) numbers for those valves are
(I've just looked them up):
12BA6 = HF93 (RF/IF pentode)
12BE6 = HK90 (pentagrid frequency changer)
12AT6 = HBC90 (double diode triode)
50B5 = (No european equivalent, but 50C5 = HL94 (output pentode)).
35W4 = HY90 (rectifier).
And I'll state that I have _never_ seen any of those valves in a UK
radio. 'H' heaters (150mA) are rare over here, as are pentagrid
converters in mains sets. A typical late-series UK AC/DC set would use :
UCH81 (triode hexode frequency changer)
UBF89 (double diode + IF amplifier pentode)
UL84 (output pentode) or UCL82 (triode output pentode)
UY85 rectifier
Or, closer to the AA5 :
UCH81
UF89 (IF pentode)
UBC80 (double diode triode)
UL84
UY85
Other possibilities include the B8A 'rimlock' valves :
UCH42, UF41, UBC41, UL41, UY41.
Or loctal valves :
UCH21 (triode hexode changer)
UCH21 (hexode as IF amplifier, triode as 1st audio)
UBL21 (double diode + output pentode)
UY21 (rectifier).
But there were plenty of other variations...
-tony