"PentaBoost" - 12 volt Pentode Booster using Submini 5672 tube

[Ratbones]

Well, embarrassingly, I mistook a FIFTEEN ohm resistor for a 1 M resistor... So all my guitar signal was merrily diverting to ground. I've got the thing working now, but my power supply is buzzing nastily. What I can hear sounds cool though! I'm running my 12v ps into a little rc network ps filter that I built, but it doesn't seem to be helping a lot... anything else I can do to clean up the nasty hum?

EDIT: Goodness gracious, apparently I need to increase my caffeine consumption if I'm going to be attempting anything electronics related.  I forgot to ground the freakin ground bus that the guitar jacks were hooked to.

Everything is working optimally now, and this thing sounds beautiful!!! I'm totally sold on this circuit, and I plan on building a pentaboost --> valvecaster build very soon!!!

[MetalUpYerEye]

I've been looking at boosters to build to drive my Blackstar HT5 a little harder on the gain channel. It does 80's thrash sounds well but doesn't have quite enough gain for new style metal...

So I had it narrowed down to the Omega from Runoffgroove, but this is sounding a bit better. What do you guys think I should build: Omega or Pentaboost?

[Magnus]

Hello together,
thank you very much for this great project Rick

I made a small layout that I build as a mojo-version,
it is verified and works, here are the files and photos from my work:

PentaBoost MkII-Layout
PCB-File for etching



I will post the pictures when the pedal is finished  


Greetings
Magnus

[esdiezy28]

Penta Boost is verified using a 6088 pentode tube. Basically the same as a 5672, but smaller total power output.

[iccaros]

My quick build...
Had a small box wanted to do something with it. \
Still needs painting, but it is cool as a lead boost. I changed the output cap to .022 so it gives a nice treble boost, not much gain.

[Magnus]

Hello together,
I don't know if I have posted my PentaBoost MkII in the "Picture-Thread" yet (I will look for it when I have some more time),
but I said I will post the pictures here - so here it is  

(finished in November 2011)



Thank you for this great circuit Rick  


Greetings
Magnus

[frequencycentral]

Nice to see this project still alive!

Really nice vintage looking layout Magnus.

[Magnus]

Hello Rick,
thank you  

It sounds really warm - from vintage to raw - a pleasure to play with  

...and it is very quiet, theres only a small bit of noise on full boost - great!


Greetings
Magnus