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Post subject: Pentode/Triode Switch In A HRDIII Help
Posted: Wed Jun 17, 2015 4:40 pm
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Just need to know where or how to install one in my hrdIII, I'm good with mods so just need directions on where in the circuit board to wire in the switch and what kind of switch to use spdt or spst etc etc


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 2:20 am
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If you want to keep the 6L6, there is really no "Triode" operation available, because you can't switch out the suppressor grid as it is an internal connection.

You could switch out the screen grids, although not really "Triode" operation. You could either break the traces going to the screen grid resistors (SGR), or disconnect one leg of each SGR and insert your DPST switch between the resistors and the circuit hole that the one leg came from. Then, wire the other part of the switch legs to the plates, to switch the SGRs from supply to Plates. (kind of effed up though)

As this diagram shows, the suppressor grid is connected internally, and can't be switched out, so it's not really "Triode"........ would that be "Quadrode"? :lol:

Image

If you really want Pentode/Triode operation you will have to switch the tubes to something like EL34, which is doable in your amp, with the ability to switch out the suppressor grid and the screen grid, albeit a little more complicated. You could use a DPST or DPDT switch, switching both suppressor grids with one pole, ground/open, and both screen grids with the other pole, connected/open.

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Last edited by shimmilou on Sun Jun 21, 2015 6:30 am, edited 2 times in total.

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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 3:06 am
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shimmilou wrote:
I
As this diagram shows, the suppressor grid is connected internally, and can't be switched out, so it's not really "Triode"........ would that be "Quadrode"? :lol:
Image




IMO switch wiring is wrong ,

http://valvesphere.blogspot.ca/2012/01/ ... ca20h.html


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 3:47 am
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It's the same thing that you referenced. But still not really "Triode/Pentode".

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Last edited by shimmilou on Sun Jun 21, 2015 6:31 am, edited 1 time in total.

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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 4:20 am
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Ok ive googled this and found that same diagram but thats all that is is a generic image of what im looking to do, Basically i want a way to 1/2 the power without changing from 6l6s(I use 5881s if it maters) and i dont want to run an attenuator or fx loop volume a they mess with the tone from the pre amp being distorted, but what i need is more specific cuz this is my first pcb amp ive modded so i need to know for ex: r201 and r202 or c16, c17


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 4:37 am
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onestepaway06 wrote:
Ok ive googled this and found that same diagram but thats all that is is a generic image of what im looking to do, Basically i want a way to 1/2 the power without changing from 6l6s(I use 5881s if it maters) and i dont want to run an attenuator or fx loop volume a they mess with the tone from the pre amp being distorted, but what i need is more specific cuz this is my first pcb amp ive modded so i need to know for ex: r201 and r202 or c16, c17



Did you look at my link ? I guess not

This is what you need


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 4:48 am
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No link showing just a image


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 4:55 am
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Wow! As the sharks say; "I'm out." :wink:

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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 4:59 am
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Wow! As the sharks say; "I'm out." :wink:

BTW, stratele52, that is not Triode operation, not even close. All that does is switch the SGR supply to the Plate supply......what is the point of that? There is only a few volts difference between the SGR supply and the Plate supply, so there will not be a significant difference. :?

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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 5:00 am
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Because thats helpful? just bail vs actually trying to help? the link you posted i overlooked, but from what i see it applies to el84s not 6l6s and still doesnt help with a hrdIII the application would be different as well as the pinout


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 5:16 am
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onestepaway06 wrote:
Because thats helpful? just bail vs actually trying to help? the link you posted i overlooked, but from what i see it applies to el84s not 6l6s and still doesnt help with a hrdIII the application would be different as well as the pinout



tubes are same with 3 grids.....just use the pins out of you own tubes.


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 5:22 am
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ok lets try this because your not understanding me, dumb it down so that its applicable to my amp bro, i have autism dude too much technical stuff and i get lost, i said it in a few of my replies i need AMP SPECIFIC application here because its a pcb board not point to point


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 5:42 am
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I know is not point to point and I do this kind of mod on a printed circuit board , a Peavy Classic 30 ( worse printed circuit than your amp ) to name just one , but I have lot of experience.

If you have no experience don't mod it . Buy the amp you need .


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 6:08 am
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I have experience ive already modded this amp for a much better tone, I also have a marshall 1974x plexi that Ive also Modded, Ive never done a 1/2 power switch in anything which is why I asked for specifics on how to do it, but im starting to see that maybe there is no comradery amongst people who know and ones who want to learn this stuff as everybody just keeps theyre answers vague and in the category of "Oh I do that mod all the time to amps" instead of "hey yea Ive done this alot, do this, this and this and youve got it" like this is some magic ability that makes everybody inferior to your knowledge, all i was looking for was a simple "hey throw a switch between resistor number blah blah, and your good" instead i get spoken to in condescending diagrams from google and vague responses of the vast knowledge of everyone, tubes have 3 separate grid pins if i use the wrong pin then what? my amps shot, so yea thats universal but only to an extent, EACH amp is different obviously I cant use bassman mods in a hrdIII even though they use the same tubes, so I ask how hard is it really to help someone else with what you know? because im not seeing help Im seeing dick mesuring of who can sound more knowledgeable


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Post subject: Re: Pentode/Triode Switch In A HRDIII Help
Posted: Thu Jun 18, 2015 6:11 am
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English is not my mother tongue , I do my best

.....to answer as polite and helpfull but with my lack of english may use the wrong words


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