EL84 subs: EL86?.. 10GK6??
Tim Reese
Jonathan Krogh <j-gkrogh@carib-link.(dot)net> wrote:
>Among the slim pickings for audio applications, I came across some 6SL7, and
>EL86, I searched around and it seems like the EL86 is a slightly lower power
>version of the EL84, can anyone confirm this for me? Id like to hear fist
>hand of the differences to be expected.
Actually the 6CW5/EL86 has a higher plate dissipation rating than the 6BQ5/EL84
(14W vs 12) so could be a bit more powerful. The main difference is the max plate
and screen rating - 275/220 for CW5 vs 250/250 for the BQ5. The EL86 has a fine
reputation as a power tube - you'll probably want to run regulated screens
though. There's an app note on the Svetlana web site re the SV83, which has
very similar characteristics to the EL86 and needs the same sort of screen
regulation: http://www.svetlana.com/docs/TechBulletins/appnoteNo.29.html
>Also, in one of the chassies I bought was five 10GK6, I searched on these
>again and they seem to be a 10v heater direct sub for EL84/6BQ5/7189 etc.
>Again can anyone confirm theyve used these at all?
Yes. Can be subbed for the 10BQ5, but a different pinout.
hth tr
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Visit http://www.nmr.MGH.harvard.edu/~reese MRI, tube audio, reptiles
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Tim Reese
Tim Reese <re...@nmr.mgh.harvard.edu> wrote:
>and screen rating - 275/220 for CW5 vs 250/250 for the BQ5. The EL86 has a fine
>and screen rating - 275/220 for CW5 vs 300/300 for the BQ5. The EL86 has a fine
Jonathan Krogh
Recently I met an old electronics guy who sold me a few power supplies and
chassies, plus he has a NOS tube stash of mostly RF and TV types.
Among the slim pickings for audio applications, I came across some 6SL7, and
EL86, I searched around and it seems like the EL86 is a slightly lower power
version of the EL84, can anyone confirm this for me? Id like to hear fist
hand of the differences to be expected.
again and they seem to be a 10v heater direct sub for EL84/6BQ5/7189 etc.
Again can anyone confirm theyve used these at all?
homebrew rigs, not productin design sub ins, a little heater voltage diff
dont scare me off.
Thanks much.
Duncan Munro
<j-gkrogh@carib-link.(dot)net> wrote:
>Hello RATS, im down here in the caribbean, and the tube gear is SCARCE.
>Recently I met an old electronics guy who sold me a few power supplies and
>chassies, plus he has a NOS tube stash of mostly RF and TV types.
>Among the slim pickings for audio applications, I came across some 6SL7, and
>EL86, I searched around and it seems like the EL86 is a slightly lower power
>version of the EL84, can anyone confirm this for me? Id like to hear fist
>hand of the differences to be expected. [...]
For the EL86, Frank Philipse has a 9 page data sheet on his site which
may be of use to you:
http://home.wxs.nl/~frank.philipse/
Can't help you with the sound differences, I don't think I've ever
seen an EL86 ;-)
--
Duncan Munro BOF #23
Mega tube data search at:
http://www.duncanamps.com/tubedata
Franz Hamberger
Jonathan Krogh <j-gkrogh@carib-link.(dot)net> schrieb in im Newsbeitrag:
8ardoo$oul$1...@news.carib-link.net...
> Hello RATS, im down here in the caribbean, and the tube gear is
SCARCE.
> Recently I met an old electronics guy who sold me a few power supplies
and
> chassies, plus he has a NOS tube stash of mostly RF and TV types.
> Among the slim pickings for audio applications, I came across some
6SL7, and
> EL86, I searched around and it seems like the EL86 is a slightly lower
power
> version of the EL84, can anyone confirm this for me? Id like to hear
fist
> hand of the differences to be expected.
The EL86 is a lower voltage version of the EL84.
It delivers the same power output at 170 volts as the
EL84 at 250 volts.
The plate dissipations are equal (12W), maximum plate and
g2 voltages are different: EL84: 300/300V, EL86: 250/200V
(Design centre maximun ratings)
> Also, in one of the chassies I bought was five 10GK6, I searched on
these
> again and they seem to be a 10v heater direct sub for EL84/6BQ5/7189
etc.
> Again can anyone confirm theyve used these at all?
The 10KG6 has a different pinout, but their characteristics are
equal to the EL84, with exception of the heater.
Franz
--
Franz Hamberger, Berlin, Germany, franz.h...@gmx.de
My Online European Tube Charts - Tubes & Valves Database at
http://www.ginko.de/user/franz.hamberger/index.html#tubes
Darryl
You were saying......
>In article <8ardoo$oul$1...@news.carib-link.net>,
>Jonathan Krogh <j-gkrogh@carib-link.(dot)net> wrote:
>>Among the slim pickings for audio applications, I came across some 6SL7, and
>>EL86, I searched around and it seems like the EL86 is a slightly lower power
>>version of the EL84, can anyone confirm this for me? Id like to hear fist
>>hand of the differences to be expected.
>Actually the 6CW5/EL86 has a higher plate dissipation rating than the 6BQ5/EL84
>(14W vs 12)
By coincidence, I was considering this same substitution the other night. The
Philips datasheet lists the EL86 as 12 watts - same as EL84.
>so could be a bit more powerful. The main difference is the max plate
>and screen rating - 275/220 for CW5 vs 250/250 for the BQ5.
..and these figures are 250/250 (EL86) vs 300/300 (EL84) in the philips sheets.
Grid dissipation is 1.75 av/ 6 peak vs 2 av/ 4 peak so plusses and minuses
there.
Cathode current is 100ma (EL86) vs 65ma (EL84)
>The EL86 has a fine
>reputation as a power tube - you'll probably want to run regulated screens
>though. There's an app note on the Svetlana web site re the SV83, which has
>very similar characteristics to the EL86 and needs the same sort of screen
>regulation: http://www.svetlana.com/docs/TechBulletins/appnoteNo.29.html
>
Given that many amps use EL84's way over rated voltage, I think there's a good
chance EL86's will work well in many EL84 applications.
Darryl
Darryl
You were saying......
>Can't help you with the sound differences, I don't think I've ever
>seen an EL86 ;-)
I have 6 telefunkens. Are they valuable? Could I sell them on ebay for a lot
of money? :-)
Darryl
per_ho...@my-deja.com
"Jonathan Krogh" <j-gkrogh@carib-link.(dot)net> wrote:
SCARCE.
> Recently I met an old electronics guy who sold me a few power supplies
and
> chassies, plus he has a NOS tube stash of mostly RF and TV types.
6SL7, and
> EL86, I searched around and it seems like the EL86 is a slightly lower
power
> version of the EL84, can anyone confirm this for me? Id like to hear
fist
> hand of the differences to be expected.
similar voltages, and with similar dissapation it preferes lower plate
load and will put through a lot more current unless biased a lot lower
(but it is done to let trough current so it is happier that way). It was
mainly intended for the use as sepp (high heater to cathode voltage
allowance) and with low plate load to use 800ohm speakes otl
(really common in late european radio sets). It's kind of unique (not
scarce, it was produced a few years ago) and a nice tube to work with.
/Pär
Sent via Deja.com http://www.deja.com/
Before you buy.
Lucian
at a bit higher voltage than the data sheet shows (about 300V plate, maybe
250V screen). The GE data book shows that these tubes can put out about 25W
in 3K PP with 250V on plate and 200V on screens, which may be an
exageration..The sound quality is remarcably good, particularly in triode
mode at 220V with a good low impedance OPT (I have tried it with a 1.9K
Hammond for an experiment - I also plan on using a Plitron toroid there, it
will have about 1.8K PP with 8 ohms load)... The experiment had four tubes
(parallel PP), but I suppose that I'll go to even 6 tubes. With 4 tubes,
220-240V on plates and the OPT above, it makes about 20W of extremely clean
audio output (triode connected). Very good sound and performance if in class
A (ran them at about 65mA per plate and the tube is holding that very well,
but it does get hot, not to the red spot level, though). I have also built
the SRPP version, with a 1K transformer for output - I don't have 1K
speakers :-) - and it sounds very good also, although it can only go to
about 10W max for two tubes at 300V supply...
Its main advantage is simplicity, with very good return for time and money:
it can be ready in about 1 hour of work, a very good counter-candidate to SE
with way better sonic results than most SE alternatives. Very sensitive
also: it needs about 5V RMS to drive, with no FB. Used a 1000uF output cap,
bled by a 2K 25W resistor and a 1k/10nF parallel damping on the OPT side. BW
is about 10Hz to 30Khz, all of it OPT dependent and no DC in the primary,
the ideal situation, eh? THD < 1% at all levels up to 6W with the original
circuit (Bonavolta's site for the original's schematic, also Emission Lab's
elaborate SEPP, entailing SS...). BTW, the power dissipation for EL86 is
HIGHER than EL84's, at 14W rather than 12W for the latter.