Telefunken EF 86 valves LC10 or LC24
- Thread starter nelly
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micaddict
Well-known member
ln76d said:
Hey In76d, do you happen to be Bulgarian?
micaddict
Well-known member
LOL, don't panick. 
It's just that there's a good E80F supplier in Bulgaria.
And from what I understand, he's a good tech, too.
But now that we're at it, would you like to share where you are from?
It's just that there's a good E80F supplier in Bulgaria.
And from what I understand, he's a good tech, too.
But now that we're at it, would you like to share where you are from?
Am not advising anything becuase i could possibly sell something
I just build my last G7 using E80F and it's a huge step even from EF806 tele.
This tube sounds like specially designed for microphones.
I'm from the land of nonsense and paranoia
I just build my last G7 using E80F and it's a huge step even from EF806 tele.
This tube sounds like specially designed for microphones.
I'm from the land of nonsense and paranoia
micaddict
Well-known member
Gotcha.
I'm from the country where all E80F tubes were made, as far as I understand.
http://www.hupse.eu/radio/tubes/E80F.htm
Interestingly, Oliver Archut once said they were all made in the Valvo plant in Hamburg (also owned by Philips BTW).
I've never understood why he would say that and unfortunately we can't ask him anymore.
Another guy who frequently mentioned the E80F was Dennis Stone (known as kidvybes here).
He also passed away recently (I still can't believe it).
He loved that tube.
I'm from the country where all E80F tubes were made, as far as I understand.
http://www.hupse.eu/radio/tubes/E80F.htm
Interestingly, Oliver Archut once said they were all made in the Valvo plant in Hamburg (also owned by Philips BTW).
I've never understood why he would say that and unfortunately we can't ask him anymore.
Another guy who frequently mentioned the E80F was Dennis Stone (known as kidvybes here).
He also passed away recently (I still can't believe it).
He loved that tube.
Sh.t!
I didn't know that Dennis passed away...
Ehh...
There's probability that were made in different factories.
Philips owned valvo and mullard.
These tubes were sold with each logo but i also found that there were some with telefunken and siemens logo.
Mustard caps, which i really like, were also sold under philips and valvo brands.
This tube was pricey at the time, even more expensive than EF806.
I didn't know that Dennis passed away...
Ehh...
There's probability that were made in different factories.
Philips owned valvo and mullard.
These tubes were sold with each logo but i also found that there were some with telefunken and siemens logo.
Mustard caps, which i really like, were also sold under philips and valvo brands.
This tube was pricey at the time, even more expensive than EF806.
micaddict
Well-known member
hitchhiker
Well-known member
Is the E80F tube a drop in sub for the EF86 in the G7 mic circuit?
With the pinout - YES.
It's little bit longer than EF86.
E80F suck more current.
This affect polarisation voltage which even with EF86 isn't equal for omni.
Anyway it should be better for 5:1 output transformer and for polarisation voltage it's only change in one resistor in original circuit.
Here's my version with E80F and 10:1 output transformer.
It's little bit longer than EF86.
E80F suck more current.
This affect polarisation voltage which even with EF86 isn't equal for omni.
Anyway it should be better for 5:1 output transformer and for polarisation voltage it's only change in one resistor in original circuit.
Here's my version with E80F and 10:1 output transformer.
Attachments
hitchhiker
Well-known member
thanks for the info ln76d.
You went with 10:1 transformer, is that a better choice for the E80F ?
You went with 10:1 transformer, is that a better choice for the E80F ?
In my opinion it's better choice for both tubes.
With 5:1 ratio and EF86, microphone output impedance should be ca. 600ohm.
With 10:1 ratio should be ca. 150ohm.
Which one is better for microphone preamp?
In my case microphone sensitivity is ca 9-10mV/pA.
It is enough for a tube microphone.
Here you have schematic with marked voltage.
With 5:1 ratio and EF86, microphone output impedance should be ca. 600ohm.
With 10:1 ratio should be ca. 150ohm.
Which one is better for microphone preamp?
In my case microphone sensitivity is ca 9-10mV/pA.
It is enough for a tube microphone.
Here you have schematic with marked voltage.
Attachments
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