[Charmed Snark[_2_]]

Today, while reading the section "Valve Numbering Systems" on page
11 of the "Radiotron Designer's Handbook" (4th ed), I came across
something that seems a bit puzzling. I thought I understood what
they meant until I checked out the two web links for the examples
listed (below).

quote

The second symbol is a letter which is allotted in sequence
commencing with A, except that I and O are not used; rectifiers
follow the sequence backwards commencing at Z. When all the single
letters of a group are exhausted, the system then proceeds with two
letters commencing with AB; combinations of identical letters are
not normally used.

***

The single-ended a.c. range has a first letter S while the second
letter may be that of the nearest equivalent in the double-ended
range -- e.g. type 6SK7 is the nearest single-ended equivalent to
type 6K7.

***
/quote

Apart from some small differences in parameters and pins, I see very
little difference between these two examples (6SK7 vs 6K7)

http://www.mif.pg.gda.pl/homepages/f.../001/6/6K7.gif
http://oldradio.qrz.ru/tubes/foreign/01/6SK7.gif

In what sense is the text referring to single vs double-ended? What
seems suspicious to me is the use of "double-ended range". Can
someone clarify what exactly they meant by this?

Thanks

--
Posted via a free Usenet account from http://www.teranews.com

[Yves Monmagnon]

"Charmed Snark" you_no_spam_me@eh a écrit dans le message de news:
.. .
Today, while reading the section "Valve Numbering Systems" on page
11 of the "Radiotron Designer's Handbook" (4th ed), I came across
something that seems a bit puzzling. I thought I understood what
they meant until I checked out the two web links for the examples
listed (below).

quote

The second symbol is a letter which is allotted in sequence
commencing with A, except that I and O are not used; rectifiers
follow the sequence backwards commencing at Z. When all the single
letters of a group are exhausted, the system then proceeds with two
letters commencing with AB; combinations of identical letters are
not normally used.

***

The single-ended a.c. range has a first letter S while the second
letter may be that of the nearest equivalent in the double-ended
range -- e.g. type 6SK7 is the nearest single-ended equivalent to
type 6K7.

***
/quote

Apart from some small differences in parameters and pins, I see very
little difference between these two examples (6SK7 vs 6K7)

http://www.mif.pg.gda.pl/homepages/f.../001/6/6K7.gif
http://oldradio.qrz.ru/tubes/foreign/01/6SK7.gif

In what sense is the text referring to single vs double-ended? What
seems suspicious to me is the use of "double-ended range". Can
someone clarify what exactly they meant by this?

Thanks

--
Posted via a free Usenet account from http://www.teranews.com

Double ended indicates a top cap connection. Here the grid1.

Yves.

[Charmed Snark[_2_]]

On 22 Mar 2007, "Yves Monmagnon" wrote in
rec.audio.tubes:


"Charmed Snark" you_no_spam_me@eh a écrit dans le message de
news:
.. .
Today, while reading the section "Valve Numbering Systems" on
page
11 of the "Radiotron Designer's Handbook" (4th ed), I came across
something that seems a bit puzzling. I thought I understood what
they meant until I checked out the two web links for the examples
listed (below).

quote

The second symbol is a letter which is allotted in sequence
commencing with A, except that I and O are not used; rectifiers
follow the sequence backwards commencing at Z. When all the
single
letters of a group are exhausted, the system then proceeds with
two
letters commencing with AB; combinations of identical letters are
not normally used.

***

The single-ended a.c. range has a first letter S while the second
letter may be that of the nearest equivalent in the double-ended
range -- e.g. type 6SK7 is the nearest single-ended equivalent to
type 6K7.

***
/quote

Apart from some small differences in parameters and pins, I see
very
little difference between these two examples (6SK7 vs 6K7)

http://www.mif.pg.gda.pl/homepages/f.../001/6/6K7.gif
http://oldradio.qrz.ru/tubes/foreign/01/6SK7.gif

In what sense is the text referring to single vs double-ended?
What
seems suspicious to me is the use of "double-ended range". Can
someone clarify what exactly they meant by this?

Thanks

--
Posted via a free Usenet account from http://www.teranews.com

Double ended indicates a top cap connection. Here the grid1.

Yves.

Ah... _that_ kind of double-ended. ;-)

Thanks

--
Posted via a free Usenet account from http://www.teranews.com