Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Colas LeGrippa on January 16, 2024, 05:56:26 pm

Title: 6V6 triode cool tone !!!!
Post by: Colas LeGrippa on January 16, 2024, 05:56:26 pm

Hola amigos, como están ?


While Linda is gone get me some beer, Id like to share a trio experience with you.  :icon_biggrin: By mistake, I had  connected the screen and plate together, in aSE amp.
The layout was so messy in there that I hadn't noticed it.
The tone of the amp was so good that I decided to draw the circuit. Then I realized the screen grid dedicated resistor and capacitor weren't connected.... :laugh:


So, I rewired the 6V6 as a pentode...with poor results: lack of definition, harsh sounding...before getting back to triode.


Has anyone noticed like me how good could
a triode sound ?


Cheers ( thanks to Linda).


Colas

Title: Re: 6V6 triode cool tone !!!!
Post by: WimWalther on January 17, 2024, 02:13:03 am

In short, YES.

In fact, the data sheets for many of the common pentode & beam power tubes have operating data and curve families for triode mode.

Title: Re: 6V6 triode cool tone !!!!
Post by: HotBluePlates on January 17, 2024, 05:02:26 am

Quote from: Colas LeGrippa on January 16, 2024, 05:56:26 pm

... rewired the 6V6 as a pentode...with poor results: lack of definition, harsh sounding...before getting back to triode. ...

One man's "harsh" is another man's "definition."

To my ear, triode-mode sounds dark & dull for output tubes.  I don't like it, and always use pentode-mode instead.

Title: Re: 6V6 triode cool tone !!!!
Post by: kagliostro on January 17, 2024, 05:17:08 am

May be on your circuit there were other things like a load that wasn't so good for the Pentode but is good for the triode connection ?


Franco

Title: Re: 6V6 triode cool tone !!!!
Post by: Colas LeGrippa on January 17, 2024, 01:47:11 pm

Maybe it depends of the rest of the circuit.
I have built a clone of the Fender showman (pentode) and it sounds amazing. A  single ended is way different than a PP though.
For now, I learned that a SE in triode mode sounds good and it's worth putting a switch to toggle between both options  to select the tone we're after. Thanks amigos


Colas

Title: Re: 6V6 triode cool tone !!!!
Post by: kagliostro on January 17, 2024, 02:32:55 pm

Quote

For now, I learned that a SE in triode mode sounds good and it's worth putting a switch to toggle between both options  to select the tone we're after.

Let us know if you reach further knowledge on this argument into the future

Ciao

Franco

Title: Re: 6V6 triode cool tone !!!!
Post by: shooter on January 17, 2024, 03:08:21 pm

Quote

I learned that a SE in triode mode sounds good

for clean amps I like it, audio also, when you want to plug a 4W SE into a Marshall stack, beat the amp within seconds of it's life, through a wimpy OT playing some Jimi, tri-mode just doesn't work

Title: Re: 6V6 triode cool tone !!!!
Post by: 66Strat on January 17, 2024, 04:06:37 pm

Single end triode coupled to full range driver is a whole nuther audiophile affliction.