807 tubes?

[cream123]

I know I posted a thread about it and I'm TGWIF came up with some great answer but the search function in the amp room doesn't work for me....

what are some normal characteristics of the 807 tube? I think the answer Christian gave me was very clean...that's all I remember

 

[cream123]

Re: 807 tubes?

bump....

 

[cream123]

Re: 807 tubes?

I know this is an old tube that no one uses but I'll bump it again

 

[the guy who invented fire]

Re: 807 tubes?

It's a 5 pin beam power tetrode, the have an annode cap, not too dis similar from a modern day 6L6GC. Standel made an amp in the 50's or maybe 60's that used a pair of them but other than that I can't think of any other guitars amps that use them...what exactally do you want to know???

 

[cream123]

Re: 807 tubes?

It's a 5 pin beam power tetrode, the have an annode cap, not too dis similar from a modern day 6L6GC. Standel made an amp in the 50's or maybe 60's that used a pair of them but other than that I can't think of any other guitars amps that use them...what exactally do you want to know???

I was just wondering about their sound characteristics in general. Do they sound like a 6l6GC? Or are they totally different in sound?

 

[the guy who invented fire]

Re: 807 tubes?

I was just wondering about their sound characteristics in general. Do they sound like a 6l6GC? Or are they totally different in sound?

They sound similar, at least thats what I've heard...807's are 5 pin tubes and use an annode cap...this is real old technology. I've only seen a few hings that even used 807's in my life and FWIW, thay were all HJi-fi amps form the 50's.

Also, keep in mind that the tone from an amp is NOT just the power tubes, or just the preamp or just any of that stuff...it's all important. I know a guy that runs EL34's in his Twin Reverb...does it make it sound like a Marshall...NO! In fact it still sounds VERY much like a Fender Twin Reverb, mostly because IT IS!

 

[cream123]

Re: 807 tubes?

alrighty, I'm thinking about ordering the Lauren amp kit for weber as an easy build. I'm just wondering what the turn out will be.....

 

[the guy who invented fire]

Re: 807 tubes?

alrighty, I'm thinking about ordering the Lauren amp kit for weber as an easy build. I'm just wondering what the turn out will be.....

what is a Lauren Amp Kit???

 

[cream123]

Re: 807 tubes?

linky!

forgot to mention it's from tedweber. :smack:

 

[tubeman87]

Re: 807 tubes?

^ That's a cool site, I've never come across it before. I'd really like to build me an amp....if I ever finish my guitars.

 

[missionamps]

Re: 807 tubes?

I was just wondering about their sound characteristics in general. Do they sound like a 6l6GC? Or are they totally different in sound?

They are similar to a 6L6 in sound but not the same tube.
They were mostly used for low power antique radio transmitters and audio modulators.

As mentioned, the anode on an 807 is on top.... instead of pin #3 as on a 6L6.
The thing is that on a 6L6, #3 pin is right next to the #2 pin, one of the filament supply pins.
Typically the filament supply is reference to ground and a very nearly a DC short to ground.
That means you can not run a 6L6 at very high voltages as it will arc across those two pins on the socket.
The 807 can be run at MUCH higher plate voltages then a 6L6s because there is no chance the plate cap on top could ever arc across from the #2 pin or #7, the other filament pin.
807 can run at close to 1000vdc in any decent RF amp.
A pair of 807 at +600vdc-700vdc can make well over 80 watts in class AB2 push pull if the rest of the circuit will support Class AB2. (6L6s might be able to do the same if they could sustain the high plate voltage without arcing over from lugs #2 to #3.
A single 807.... maybe 10-12 watts in SE Class A at >+400vdc with the screen tied way down around <+250vdc.
A single 6L6GC in class A could do that all day long.

So, other then just to say you did it, I can't think of any good reason to use an 807.
Why? Because, the only obvious reason you would use an 807 is so you can run at it very high plate voltages like +600vdc to 1000vdc and you would not do that in a class A audio amp because, normally, high plate voltages on the single power tube don't really workout that great or sound that good in SE class A amps.

Personally I think the SE class A 807 in the Lauren amp is just a sales gimmick and Weber just had a nostalgic thing for them since, like me, he is an old time ham radio guy too. Nobody really uses them for much of anything anymore.
Again, you can get the same 12 watts output power with a 6L6GC or EL34.

Isn't the Lauren just SE Princeton type amp using a bigger PT and that 25 watt OT with a 25-30 watt power tube instead of a 12 watt one?
I'd probably just build and amp with a higher current PT, bigger SE OT and use a 6L6GC or even an EL34.
Or you could order one of those kits and an extra octal socket so you could rebuild it with a 6L6 later if you wanted too.

 

[cream123]

Re: 807 tubes?

They are similar to a 6L6 in sound but not the same tube.
They were mostly used for low power antique radio transmitters and audio modulators.

As mentioned, the anode on an 807 is on top.... instead of pin #3 as on a 6L6.
The thing is that on a 6L6, #3 pin is right next to the #2 pin, one of the filament supply pins.
Typically the filament supply is reference to ground and a very nearly a DC short to ground.
That means you can not run a 6L6 at very high voltages as it will arc across those two pins on the socket.
The 807 can be run at MUCH higher plate voltages then a 6L6s because there is no chance the plate cap on top could ever arc across from the #2 pin or #7, the other filament pin.
807 can run at close to 1000vdc in any decent RF amp.
A pair of 807 at +600vdc-700vdc can make well over 80 watts in class AB2 push pull if the rest of the circuit will support Class AB2. (6L6s might be able to do the same if they could sustain the high plate voltage without arcing over from lugs #2 to #3.
A single 807.... maybe 10-12 watts in SE Class A at >+400vdc with the screen tied way down around <+250vdc.
A single 6L6GC in class A could do that all day long.

So, other then just to say you did it, I can't think of any good reason to use an 807.
Why? Because, the only obvious reason you would use an 807 is so you can run at it very high plate voltages like +600vdc to 1000vdc and you would not do that in a class A audio amp because, normally, high plate voltages on the single power tube don't really workout that great or sound that good in SE class A amps.

Personally I think the SE class A 807 in the Lauren amp is just a sales gimmick and Weber just had a nostalgic thing for them since, like me, he is an old time ham radio guy too. Nobody really uses them for much of anything anymore.
Again, you can get the same 12 watts output power with a 6L6GC or EL34.

Isn't the Lauren just SE Princeton type amp using a bigger PT and that 25 watt OT with a 25-30 watt power tube instead of a 12 watt one?
I'd probably just build and amp with a higher current PT, bigger SE OT and use a 6L6GC or even an EL34.
Or you could order one of those kits and an extra octal socket so you could rebuild it with a 6L6 later if you wanted too.

wow, that's a lot of info. Thanks for the heads up.

 

[the guy who invented fire]

Re: 807 tubes?

wow, that's a lot of info. Thanks for the heads up.

Trust what Bruce tells you, he is hands down one of the best in the biz!!!