807 tube specs and data.
Bill Douroukis
Can any one give full specs on the 807 tube both triode and ultralinear,
single ended and push pull. The more info the better. Ifyanyone has amp
cicuits which involve these tubes also.
Thankyou...
Mattijs de Vries
Hello all,
>Can any one give full specs on the 807 tube both triode and ultralinear,
>single ended and push pull. The more info the better. Ifyanyone has amp
>cicuits which involve these tubes also.
I'm also looking very badly for these data. I seems that the 6L6 curves can be
used, but I'm not too sure about that. There are several values not the same
with these tubes.
I'm now designing (and sure will build) an 807 triode PP amplifier. It should
give me about 16 watts, I will use a ECC83 as pre and a 5687 as driver, in
quite a nice configuration (longtailed pair directly coupled to a driver pair).
More about that later on my WWW-pages.
Anyway, specs (especially curves) of the 807 will be greatly appreciated. I
you send them to me, I can scan them and publish them on the WWW, so that
they can be seen by everyone. Hope to hear from you all.
---
_ Mattijs de Vries Ing.
__|_|__
| __|__ | E-mail : Mattijs...@student.utwente.nl
/ | | \ URL : Http://Cam041214.student.utwente.nl
| | | | Adress : Campuslaan 41-214, 7522 NG Enschede
| | | | Country : The Netherlands, Europe
| |_____| | Phone : +31-53-4895091
\_/|_|\_/ ---------------------------------------------------
|_______| "Nothing shocks me, I'm a scientist", Indiana Jones
|| || ---------------------------------------------------
Duncan Munro
On 4 Jun 1997 14:45:13 GMT, mattijs...@student.utwente.nl
(Mattijs de Vries) wrote:
>Hello all,
>
>>Can any one give full specs on the 807 tube both triode and ultralinear,
>>single ended and push pull. The more info the better. Ifyanyone has amp
>>cicuits which involve these tubes also.
>
>I'm also looking very badly for these data. I seems that the 6L6 curves can be
>used, but I'm not too sure about that. There are several values not the same
>with these tubes.
> : :
Mattijs/Bill,
Wanting the same info, I posted a little while back for info on the
same subject - if you want to check it out, try a DejaNews search for
"807 Data Sheets".
The response I got via the NG and private mails indicated that the
parameters of the 6L6 could be substituted. When I eventually got
hold of my valve tester, I did some back to back plots between the two
types, and got identical results - even to the point of the slight
tetrode kink being in the same place.
Mattijs: You mention that several values are not the same, I assume
you mean the ratings. One concern of mine was the published 300V max
screen grid rating.
I did not get to the bottom of this one, although I now know they can
run in triode mode for audio applications at 400V - this will apply a
rather tasty 700V or thereabouts to the screen grid on peaks, so I
know they don't have an insulation problem.
ps: I haven't managed to fire mine up yet at anode/screen 430v/410v in
an amplifier, but when I've managed to get hold of some UX5 bases,
I'll let you know....
Regards,
Duncan
-----
Duncan Munro
http://www.muffy.demon.co.uk/
David Crittle
Duncan Munro wrote:
> Mattijs: You mention that several values are not the same, I assume
> you mean the ratings. One concern of mine was the published 300V max
> screen grid rating.
>
> I did not get to the bottom of this one, although I now know they can
> run in triode mode for audio applications at 400V - this will apply a
> rather tasty 700V or thereabouts to the screen grid on peaks, so I
> know they don't have an insulation problem.
>
> ps: I haven't managed to fire mine up yet at anode/screen 430v/410v in
> an amplifier, but when I've managed to get hold of some UX5 bases,
> I'll let you know....
>
Running 807 tubes in triode, for example in the Williamson amplifier,
puts more than 300 v on the screen. The A515 article in 1947
Radiotronics gives Fritz Langford-Smith's comments on this. I don't know
if he mentions it in RTDH, but if anyone is interested I can email the
full article.
____________________
Yours Faithfully
David Crittle
retr...@wagga.net.au
____________________
Remember what Dr Seuss told you: "Well we can do it, we know how! If you
never did, you should. These things are fun, and fun is good."
Ross Matheson
David Crittle <retr...@wagga.net.au> wrote:
:Duncan Munro wrote:
:
:> Mattijs: You mention that several values are not the same, I assume
:> you mean the ratings. One concern of mine was the published 300V max
:> screen grid rating.
:>
:> I did not get to the bottom of this one, although I now know they can
:> run in triode mode for audio applications at 400V - this will apply a
:> rather tasty 700V or thereabouts to the screen grid on peaks, so I
:> know they don't have an insulation problem.
:>
:> ps: I haven't managed to fire mine up yet at anode/screen 430v/410v in
:> an amplifier, but when I've managed to get hold of some UX5 bases,
:> I'll let you know....
:>
:
:Running 807 tubes in triode, for example in the Williamson amplifier,
:puts more than 300 v on the screen. The A515 article in 1947
:Radiotronics gives Fritz Langford-Smith's comments on this. I don't know
:if he mentions it in RTDH, but if anyone is interested I can email the
:full article.
David: The short note on the A515 in RDH4 p346-7 doesn't mention this or
in fact any voltages at all, article or circuit - it's just a summary.
Thanks for the full article - but in that he mentions testing the 807 at
400 volts (with no failures, and subsequently putting on 'life test')
because that was "in excess of the published triode ratings" . Yet ,
Duncan: The STC data sheet confirms (perhaps the same source you saw ?)
Triode Connection Max Plate Voltage 400 volts, Max DC current 125mA
as opposed to tetrode connection plate 600, screen 300, but I see no
limitation to audio use only mentioned. It does further note that for
triode connection that the plate and screen should be connected together
through a 100 ohm resistor or an RF choke of about 20 microhenries.
*Also, in HiFi World I notice Sussex Surplus selling ceramic UX5 bases*
Hmm. I've just found another xerox I made some time back of a very old
manual in small booklet form that I carelessly didn't identify - maybe
Sylviana, since I also borrowed the RCA TT Guide 1946 at the time -
about the same size - and it has AF AB1 triode data max CCS and ICAS
ratings 400V/125mA as above, but additionally "max.-sig. plate + g2
input 50 W max", (for CCS +ICAS) and "plate dissipation + g2 input 25W
CCS, 30W ICAS. Strangely it then gives typical operation at 400 V with
zero-sig/max-sig plate currents of 60 and 140 mA ! (g1 -45, 3k a-a, peak
AF g1-g1 90v, 15W, 3%D) There are some plate curves incl: triode mode.
Unfortunately, I don't have a scanner, or access to one, and I haven't
gotten around to a web page. But, from a visit to Duncan's pages
(very nice !) I see Mattijs has a new section since my last visit incl:
http://cam041214.student.utwente.nl/mattijs/stereo/audio/!Tubes/!sheets/807.zip
which must be the only 807 datasheets on the web so far - what's still
required ? (I didn't download it this time, having a full HD right now)
Regards
Ross Matheson
Ross Matheson
I earlier wrote:
:Duncan: The STC data sheet confirms (perhaps the same source you saw ?)
I've since have seen Mattijs' post , and on a revisit to Duncan's to get
807.zip spotted 807.pdf and got that (is it identical ? - ends at p12?).
Good job ! [ I hadn't realised it WAS the STC sheets, D'UH ! :-{ ]
:Hmm. I've just found another xerox I made some time back of a very old
:manual in small booklet form that I carelessly didn't identify - maybe
:Sylviana, since I also borrowed the RCA TT Guide 1946 at the time -
:Unfortunately, I don't have a scanner, or access to one, and I haven't
Of course one can always take copy to a print shop - anyway, I since
find I may have access to one I hope to email (or snailmail if not!)
these other 807 plate curves to one of you in the near future.
The triode mode curves look especially interesting, catering to A2
operation I think, and on a larger axis scale than the STC one.
Ross Matheson
"I appreciate the fact that this draft was done in haste, but some of
the sentences that you are sending out in the world to do your work for
you are loitering in taverns or asleep beside the highway."
-- Dr. Dwight Van de Vate, Professor of Philosophy,
University of Tennessee at Knoxville
David Crittle
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The 807 triode max ratings allow for up to 400 volts on the screen grid,
as shown below. If anyone wants the full specs, email me.
--
____________________
Yours Faithfully
David Crittle
retr...@wagga.net.au
____________________
Remember what Dr Seuss told you: "Well we can do it, we know how! If you
never did, you should. These things are fun, and fun is good."
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Martin Ackroyd
Someone wrote:
>
> > Mattijs: You mention that several values are not the same, I assume
> > you mean the ratings. One concern of mine was the published 300V max
> > screen grid rating.
> >
> > I did not get to the bottom of this one, although I now know they can
> > run in triode mode for audio applications at 400V - this will apply a
> > rather tasty 700V or thereabouts to the screen grid on peaks, so I
> > know they don't have an insulation problem.
> >
>
I always imagined it is because the screen grid has a much
easier life in triode mode: When the anode dips down to
a low voltage in pentode mode, the screen current rises
far above the standing current. But in triode mode, the
screen voltage drops the same as the anode voltage, so the screen
current
dips along with the anode current, too.
Never forget how the first sign I had disconneted the anode
supply to an amplifier with 6V6s was the screen grids glowing
bright orange.
Cheers,
Martin Ackroyd
David Crittle
Duncan Munro wrote:
>
> I did not get to the bottom of this one, although I now know they can
> run in triode mode for audio applications at 400V - this will apply a
> rather tasty 700V or thereabouts to the screen grid on peaks, so I
> know they don't have an insulation problem.
>
Screen rating in pentode connection is 300 volt max.
Screen rating in triode connection is 400 volt max
I can email the original specs
David Crittle
Martin Ackroyd wrote:
>
> I always imagined it is because the screen grid has a much
> easier life in triode mode: When the anode dips down to
> a low voltage in pentode mode, the screen current rises
> far above the standing current. But in triode mode, the
> screen voltage drops the same as the anode voltage, so the screen
> current
> dips along with the anode current, too.
>
> Never forget how the first sign I had disconneted the anode
> supply to an amplifier with 6V6s was the screen grids glowing
> bright orange.
>
Yeah, and the anode is much more likely to be accidently disconnected on
an 807 because of the top cap connection