Ultimately, my best contributions tend to be immaterial.Ron Worley wrote:Obviously, it's electrically immaterial, but I will check it out and correct if it's backward..... it very likely that you are right!!
Rocket Documents
Moderators: pompeiisneaks, Colossal
Re: Rocket Documents
- Ron Worley
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- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Perhas a dumb question.??
Guys... new to the forum here but I was wondering if it possible to just remove two of the El84s from the circuit... would to do this require one to change all the rest of the circuit due to voltage shifts etc?
Thought this might give one a lower wattage amp?
Thanks
Tony
Thought this might give one a lower wattage amp?
Thanks
Tony
Re: Rocket Documents
Seems like the labeling of V5 and V6 should be switched around in the schematic. As it is, one side of the OT primary goes to V4 and V6, and the other side goes to V5 and V7.
- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Re: Rocket Documents
It can be (and has been) done either way: V4&5, and V6&7 together or 4&6, 5&7 respectively
Ron
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C4 Cap
the optional C4 cap, which i believe to be a cathode bypass cap for V2, is said to "increase gain"??? would it just go in parallel with R7?
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Re: Rocket Documents
Precisely! It is a cathode bypass cap and would go in parallel with R7. It allows AC coming through the tube to pass to ground. Thus, not allowing it to mess with with bias of the tube (e.g., cutting off too soon).
Do note that polarity is important if using electrolytics in this spot. + end goes toward the tube. - end to ground.
Cathode bypass caps also represent an excellent tone shaping tool. Higher values produce a more low end rich tone. Lower values the opposite.
Cheers,
Dave O.
Do note that polarity is important if using electrolytics in this spot. + end goes toward the tube. - end to ground.
Cathode bypass caps also represent an excellent tone shaping tool. Higher values produce a more low end rich tone. Lower values the opposite.
Cheers,
Dave O.
Re: Rocket Documents
Put that cap on a switch because you're not going to always want that much gain if you know what I mean.
I usually add a 10uf and 22-25uf on a switch: down 10uf, center off, and up 25uf boost.
Actually even as low as 2uf can really add some nice gain. Make that a 3 way switch for some nice flexibility.
Add another switch for the V1a bypass cap for .68 low and standard 25uf for high tone switching.
Mark
I usually add a 10uf and 22-25uf on a switch: down 10uf, center off, and up 25uf boost.
Actually even as low as 2uf can really add some nice gain. Make that a 3 way switch for some nice flexibility.
Add another switch for the V1a bypass cap for .68 low and standard 25uf for high tone switching.
Mark
footswitch
Or do a foot-switch.
A
A
Re: Rocket Documents
Or do a foot switch, yes that is a nice option Ange.
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Re: Rocket Documents
I love it. I am going to mini toggle the hell out of my rocketM Fowler wrote:Put that cap on a switch because you're not going to always want that much gain if you know what I mean.
I usually add a 10uf and 22-25uf on a switch: down 10uf, center off, and up 25uf boost.
Actually even as low as 2uf can really add some nice gain. Make that a 3 way switch for some nice flexibility.
Add another switch for the V1a bypass cap for .68 low and standard 25uf for high tone switching.
Mark
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Re: Rocket Documents
Mark I dont fully understand the high tone switching. Brite switch?M Fowler wrote:Put that cap on a switch because you're not going to always want that much gain if you know what I mean.
I usually add a 10uf and 22-25uf on a switch: down 10uf, center off, and up 25uf boost.
Actually even as low as 2uf can really add some nice gain. Make that a 3 way switch for some nice flexibility.
Add another switch for the V1a bypass cap for .68 low and standard 25uf for high tone switching.
Mark
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Corrections not reflected in down-loadable files
Hi Guys,
I am new to the forum. Just wondering why it is that the down-loadable files do not reflect the corrections for the errors you already identified?
Andy
I am new to the forum. Just wondering why it is that the down-loadable files do not reflect the corrections for the errors you already identified?
Andy
Re: Perhas a dumb question.??
Most just call that a half-power mod - some do it by separating the cathode bias resistors and lifting the ground connection on one pair. True, it will make a subtle difference in voltages - up to you if it matters.fayser wrote:Guys... new to the forum here but I was wondering if it possible to just remove two of the El84s from the circuit... would to do this require one to change all the rest of the circuit due to voltage shifts etc?
Thought this might give one a lower wattage amp?
Thanks
Tony
You could make a half power (18 watter) or 30 watter with a switch - if the former, you won't have the "correct" trannie set (since Ken never did it that way).