Triode Pentode Switch vs Sound Quality

[DavesNotHere]

I should study then, how designs like my Bugera V22, with a triode/pentode switch, deal with this.

Usually the compromise is in the plate voltage. They find a mean for that. Some will change bias technique from fixed in pentode to self bias too.

 

[Wavebourn]

Btw how did your project with your coffee maker go?

What? 😱

Usually the compromise is in the plate voltage. They find a mean for that. Some will change bias technique from fixed in pentode to self bias too.

What? 😱

 

[FullRangeMan]

May I make a suggestion to you, why not use currently manufactured tubes. There is nothing wrong with them, and there is nothing to gain using non standard tubes.

Btw how did your project with your coffee maker go?

GK71 and 4П10C are russian military tubes not sino commercial grade tubes, 4П10C peak plate tension is 3K Volts.

GMI-11 Tetrode are said to last til 25 years in the Sukhoi 29 radar, the same spam as the jet. What bother me in current crop tubes is not its hi price but his low reliability of ridiculus life spam of 2k hours(in the best conditioms) what in the real life, no soft start are 1K hours.

 

[Miles Prower]

The 807 tube is tetrode, not a pentode.

No it isn't. Pent= 5 (electr)ode(s) Count 'em

1) Cathode
2) Control grid
3) Screen grid
4) Beam formers
5) Plate

5 electrodes: therefore pentode

Beam formers were originally designed to beat the Phillips patent on pentodes with suppressor grids. They called 'em "tetrodes" to avoid giving Philips any reason to sue for infringement. The inclusion of beam formers accomplished the same objective: to greatly reduce the negative resistance "kinks" caused by secondary emission.

After the patent expired, they kept on making beam formers because this turned out to be a better design: more extensive saturation region, less power wasted in screen current, higher plate voltage swing, more like a GLASSFET.

 

[Kay Pirinha]

It has yet been said in #40...


Best regards!