Hi,

Has anyone ever implemented a gilbert cell mixer using valves instead
of FETs?
I'm considering this instead of using the increasingly rare and costly
heptode mixer.

Thanks,

The Eternal Squire
(yes, I have a call, I just like my privacy)

"The Eternal Squire" wrote in message
om...
Hi,

Has anyone ever implemented a gilbert cell mixer using valves instead
of FETs?
I'm considering this instead of using the increasingly rare and costly
heptode mixer.

There was some sort of dual tetrode (6164?) that used to be used in high
performance mixers for valve radios.

Leon

6U8 or 6X8 are a dime a dozen and great mixers. Also 6BL8, 6EA8 are good
up to 220MHz. 6J6 goes to 600MHz.

I have tried to develop "glass Gilberts", but tubes are too linear.

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

the greatest valve mixer ever was based on 7360. a dual beam tetrode
specifically meant for being a high dynamic range mixer.

you can also try making a commutation mixer with four triodes.

- farhan

Behold, Ashhar Farhan signalled from keyed 4-1000A filament:

the greatest valve mixer ever was based on 7360.

snip

How true!!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Gregg wrote:
Behold, Ashhar Farhan signalled from keyed 4-1000A filament:


the greatest valve mixer ever was based on 7360.


snip

How true!!

There were also some tv tubes used in chroma demodulators
that were sorta 7360 ish. The 6AR8 for one, I know there
were a few others.

BTW you had to use mu-metal shields on these for best
results.

Ken Scharf wrote:

Gregg wrote:

Behold, Ashhar Farhan signalled from keyed 4-1000A filament:


the greatest valve mixer ever was based on 7360.



snip

How true!!

There were also some tv tubes used in chroma demodulators
that were sorta 7360 ish. The 6AR8 for one, I know there
were a few others.

BTW you had to use mu-metal shields on these for best
results.

And if you're going to design anything new, the 7360 is on sale for only
$27 a pop (down from $49!) while the 6AR8 is about $5.

Four diodes and a couple of ferrite cores, on the other hand...

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Behold, Ken Scharf signalled from keyed 4-1000A filament:

Gregg wrote:
Behold, Ashhar Farhan signalled from keyed 4-1000A filament:


the greatest valve mixer ever was based on 7360.


snip

How true!!

There were also some tv tubes used in chroma demodulators that were
sorta 7360 ish. The 6AR8 for one, I know there were a few others.

BTW you had to use mu-metal shields on these for best results.

Hi Ken,

I have experimented with those - their noisy as stink above 4MHz :-(

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

Ken Scharf wrote:

Gregg wrote:

Behold, Ashhar Farhan signalled from keyed 4-1000A filament:


the greatest valve mixer ever was based on 7360.



snip

How true!!

There were also some tv tubes used in chroma demodulators
that were sorta 7360 ish. The 6AR8 for one, I know there
were a few others.

BTW you had to use mu-metal shields on these for best
results.

And if you're going to design anything new, the 7360 is on sale for only
$27 a pop (down from $49!) while the 6AR8 is about $5.

Four diodes and a couple of ferrite cores, on the other hand...

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Behold, Ken Scharf signalled from keyed 4-1000A filament:

Gregg wrote:
Behold, Ashhar Farhan signalled from keyed 4-1000A filament:


the greatest valve mixer ever was based on 7360.


snip

How true!!

There were also some tv tubes used in chroma demodulators that were
sorta 7360 ish. The 6AR8 for one, I know there were a few others.

BTW you had to use mu-metal shields on these for best results.

Hi Ken,

I have experimented with those - their noisy as stink above 4MHz :-(

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca