IM SO CONFUSED

[gball]

I had a Tweaker 15. It really didn't do Fender or Marshall. I thought it was kind of bland.

A buddy of mine has one (not sure the model). Seems like it tries to be too many things instead of just being itself, which waters it all down. Totally agree it is kind of bland

 

[Astral Traveler]

If @eSGEe can get a Dumble for less than $250, I will walk through the mall in a pair of speedos.

I'm sure we can find some sort of loophole here...

 

[Astral Traveler]

I use one of these and I use it for everything, it works perfectly at home too.

Not a single glowing glass bottle inside but it has three, yes three LED's.

Sorry, I forgot the question...

 

[Astral Traveler]

Oh right! I'd say rest comfortably, or go Kemper.

 

[chilipeppermaniac]

A buddy of mine has one (not sure the model). Seems like it tries to be too many things instead of just being itself, which waters it all down. Totally agree it is kind of bland

Gotcha, sounds like a bland type.

 

[Cadorman]

I brought the DSL1HR up north this weekend. Been playing it on .1 watt while the wife watches TV right beside it. I'm going to crank it up when she goes to shower.

 

[Don O]

Can contain every known amp type in the world.



Just add a Kemper play back unit

 

[eSGEe]

If @eSGEe can get a Dumble for less than $250, I will walk through the mall in a pair of speedos.

well I never wanted a DUMBLE but now Im certainly intrigued at the prospect ............................

DO DUMBLE models in a VOX count -- (Vox was like 180.00) --- has 4 or 5 dumble options .....so ,,, maybe a FAKE speedo and a long shirt? But gotta wear the stiletto's

 

[Astral Traveler]

well I never wanted a DUMBLE but now Im certainly intrigued at the prospect ............................

DO DUMBLE models in a VOX count -- (Vox was like 180.00) --- has 4 or 5 dumble options .....so ,,, maybe a FAKE speedo and a long shirt? But gotta wear the stiletto's

Let's let him off the hook with the Speedos since it's not a real Dumble and settle for a mankini shall we? I feel we're being more than generous here.

 

[ivan H]

6CA7 not 6AC7
and there are certain amps, like traynor which cannot use 6CA7 in place of EL34s.
Including PV Windsor.
Watch out for that.

Good catch AMS

How come Traynor doesnt accept the 6CA7?( thanks for clearing up the typo by the way, 6AC7 is a completely different old tube never really used much in guitar amps past the 50s and common at that lol). I always thought that they were basically reasonably compatible. Is it because its not a true Pentode and actually a beam tetrode?

The EL34 & the 6CA7 are basically compatible & even the pin-outs are the same. Although we sometimes see them labelled as EL34/6CA7 or 6CA7/EL34 & see them both drawn the same schematically on datasheet's, a "true EL34" is a pentode (that feature a suppressor grid) & a "true 6CA7" is a "beam tetrode" (that feature beam forming plates & no suppressor grid).
Most amps that use pentode type power tubes like the EL34 don't actually make use of the tube as a pentode in that they tie the cathode & suppressor grid together at the valve socket (pins 1 & 8), so are actually using the tube as a tetrode.
To use the EL34 as a pentode, pin 1 (suppressor grid) & pin 8 (cathode) are kept separate (not tied together at the socket) & a negative voltage is applied to the suppressor grid (pin 1). This works to repell any electrons that bounce off the plate (secondary emission) "back" to the plate, thus running the tube more efficiently. The negative voltage supplying the suppressor grid is often derived from the fixed negative bias supply.
Some Traynor amps run the EL34's as a pentode in this fashion, & though I haven't looked, I'm imagining that the Peavey Windsor does too.
A true 6CA7 beam tetrode is run by having the beam forming plates tied to the cathode, in fact, some beam tetrode type tubes have these elements tied together internally.
Because (some) Traynor's run the EL34's as a pentode by applying a negative voltage to the (pin 1) suppressor grid, a 6CA7 beam tetrode cannot be plugged straight in.
Here's a diagram showing the internal elements of a pentode
Here's a diagram showing the internal elements of a beam tetrode
Now after reading this long winded rant, I'm imagining that @eSGEe is more confused than ever. Cheers

 

[Clockworkmike]

Good catch AMS

The EL34 & the 6CA7 are basically compatible & even the pin-outs are the same. Although we sometimes see them labelled as EL34/6CA7 or 6CA7/EL34 & see them both drawn the same schematically on datasheet's, a "true EL34" is a pentode (that feature a suppressor grid) & a "true 6CA7" is a "beam tetrode" (that feature beam forming plates & no suppressor grid).
Most amps that use pentode type power tubes like the EL34 don't actually make use of the tube as a pentode in that they tie the cathode & suppressor grid together at the valve socket (pins 1 & 8), so are actually using the tube as a tetrode.
To use the EL34 as a pentode, pin 1 (suppressor grid) & pin 8 (cathode) are kept separate (not tied together at the socket) & a negative voltage is applied to the suppressor grid (pin 1). This works to repell any electrons that bounce off the plate (secondary emission) "back" to the plate, thus running the tube more efficiently. The negative voltage supplying the suppressor grid is often derived from the fixed negative bias supply.
Some Traynor amps run the EL34's as a pentode in this fashion, & though I haven't looked, I'm imagining that the Peavey Windsor does too.
A true 6CA7 beam tetrode is run by having the beam forming plates tied to the cathode, in fact, some beam tetrode type tubes have these elements tied together internally.
Because (some) Traynor's run the EL34's as a pentode by applying a negative voltage to the (pin 1) suppressor grid, a 6CA7 beam tetrode cannot be plugged straight in.
Here's a diagram showing the internal elements of a pentodeView attachment 55697
Here's a diagram showing the internal elements of a beam tetrodeView attachment 55698
Now after reading this long winded rant, I'm imagining that @eSGEe is more confused than ever. Cheers

You're a wizard, dude, im confident now lol

 

[ivan H]

You're a wizard, dude, im confident now lol

Thanks Clockworkmike, but I'm no wizard, just have a little experience with these glass bottles. Cheers

 

[Clockworkmike]

Thanks Clockworkmike, but I'm no wizard, just have a little experience with these glass bottles. Cheers

You certainly know your stuff dude; one of the resident genius tech gurus we got here thankfully lol

 

[ivan H]

You certainly know your stuff dude; one of the resident genius tech gurus we got here thankfully lol

With valves/valve electronics in general, older single layer type printed circuit board amps, turret/eyelet board type amps or point to point type amps, maybe, but when it comes to modern multi-layer circuit board/multi-channel type amps (which I avoid like the plague or COVID-19), AMS would definitely be more experienced & more knowledgeable about than me. Cheers

 

[eSGEe]

Good catch AMS

The EL34 & the 6CA7 are basically compatible & even the pin-outs are the same. Although we sometimes see them labelled as EL34/6CA7 or 6CA7/EL34 & see them both drawn the same schematically on datasheet's, a "true EL34" is a pentode (that feature a suppressor grid) & a "true 6CA7" is a "beam tetrode" (that feature beam forming plates & no suppressor grid).
Most amps that use pentode type power tubes like the EL34 don't actually make use of the tube as a pentode in that they tie the cathode & suppressor grid together at the valve socket (pins 1 & 8), so are actually using the tube as a tetrode.
To use the EL34 as a pentode, pin 1 (suppressor grid) & pin 8 (cathode) are kept separate (not tied together at the socket) & a negative voltage is applied to the suppressor grid (pin 1). This works to repell any electrons that bounce off the plate (secondary emission) "back" to the plate, thus running the tube more efficiently. The negative voltage supplying the suppressor grid is often derived from the fixed negative bias supply.
Some Traynor amps run the EL34's as a pentode in this fashion, & though I haven't looked, I'm imagining that the Peavey Windsor does too.
A true 6CA7 beam tetrode is run by having the beam forming plates tied to the cathode, in fact, some beam tetrode type tubes have these elements tied together internally.
Because (some) Traynor's run the EL34's as a pentode by applying a negative voltage to the (pin 1) suppressor grid, a 6CA7 beam tetrode cannot be plugged straight in.
Here's a diagram showing the internal elements of a pentodeView attachment 55697
Here's a diagram showing the internal elements of a beam tetrodeView attachment 55698
Now after reading this long winded rant, I'm imagining that @eSGEe is more confused than ever. Cheers

what language is this written in?

 

[Jethro Rocker]

Thanks Clockworkmike, but I'm no wizard, just have a little experience with these glass bottles. Cheers

I have some experience with glass bottles roo.

 

[ivan H]

I have some experience with glass bottles roo.

View attachment 55699

Haha, I have a little experience with these type bottles too, just a little. Cheers

 

[syscokid]

The EL34 & the 6CA7...

In general, is there a difference in performance between these two types of power tubes?

a "true EL34" is a pentode...

So, most of us EL34 users are operating these tubes as tetrodes? Now I feel like I've been short-changed for the last 40 years...

 

[Amp Mad Scientist]

How come Traynor doesnt accept the 6CA7?( thanks for clearing up the typo by the way, 6AC7 is a completely different old tube never really used much in guitar amps past the 50s and common at that lol). I always thought that they were basically reasonably compatible. Is it because its not a true Pentode and actually a beam tetrode?

In this configuration, EL34 is a pentode. The bias negative voltage is tied to the suppressor grid.
This decreases the efficiency of the tube.

 

[Clockworkmike]

In this configuration, EL34 is a pentode. The bias negative voltage is tied to the suppressor grid.
This decreases the efficiency of the tube.

Gotcha, appreciate that! So by that logic then, a Traynor could operate with something like a KT77 since its a pentrode as well, but a Kt66 would not work either since its a beam tetrode like the 6CA7?