faux Ge treble booster?

[m_charles]

Hi,

Has anyone ever seen, done, or know of a Rangemaster type treble boost, using a SILICONE tranny, but modded to mimic a germanium tranny?

Similar to the Fuzzface mods often done to sili clones. My favorite being Justin's on http://fuzzcentral.ssguitar.com/axisface.php

In some respects I like it better than than my Ge.

So I'm wondering if anyone has ever attempted this for a Rangemaster. I think it'd be kinda neat!

chuck

[brett]

Hi
you could "piggyback" two silicon devices (e.g. TIP31s, BD139s) to get nice low hFE and high capacitance.
Use the seach function to find out about piggybacking.
have a great day

[m_charles]

thanks, but I have a few ideas how to go about it, was just curious to see if anyone had given it a try already.

Anyone?

[zyxwyvu]

You could check out the Brian May Treble Booster:

http://www.generalguitargadgets.com/index.php?option=content&task=view&id=76&Itemid=105
http://www.tonepad.com/project.asp?id=40

[m_charles]

Thanks, but thats still not what I mean (not trying to sound snotty). I mean approaching it like the "Axis Face" on fuzzcentral http://fuzzcentral.ssguitar.com/axisface.php

I know there are a few silicone treble boosters out there, but I mean specifically trying to mimic a Ge tranny with a Si. Shaving spikyness with small value caps, low gain si trannys etc.

It's not that I can't afford to order a pre-measured ge tran from small bear, it just seemed like an interesting idea. I thought for sure I wasn't the first to think of it. And FYI, I know you can just pop an Si in there and tweak the resistors to rebias, but what I mean is seeing how close to a great vintage rangemaster you can get "faking" it with an Si using the same basic circuit as the RMaster (with tweaks of course).

Maybe it's a waste of time, but thats never stopped many of us before!

chuck

[brett]

Hi
RE:

Shaving spikyness with small value caps, low gain si trannys etc.

Cutting highs with the bypass cap is a good start, but you'll also want a "starved" low hFE transistor.  That's what piggybacking a couple of power transistors will do.  The hFE will be working in the "knee" region of the hFE vs Ic curve. 

But don't believe me.  Socket the Q in a Rangemaster and try both a 2N2369A and a pair of piggybacked TIP31s or BD139s, and take your pick !
cheers