What have you built from a London Power book?

[Mark]

Whilst driving home it occurred to me that I haven't built any circuits or amps from the London Power books that I own which I thought was a bit odd as the books were very popular.

Has anyone out there built any preamps and power circuits into an amp?

What worked for you and what circuits do you recommend?

[frankdrebin]

The 4 stage High gain is pretty good for that Roccaforte style sound,other than that I used many bits here and there to mod various amps,champ,800,power supply mods.

[Mark]

Thanks for your reply Frank. What book is the four stage preamp in?

What power supply mods did you like in particular?

I've used a few things from Blenecoe's book and website, but I have three books and I can't remember using a London Power circuit.

[TUBEDUDE]

I use the all tube effects loop in almost all of my builds. Best loop i've found.

[stephenl]

I've built two of the TUT5 Standards - one with the LP 25 watt PA, the other with my own design 50 watt PA.

• Both are PowerScaled.
  One with the BFX effects loop.
  The other with BFX and REV push-pull reverb.
  The clean channel sounds like a really good Fender.
  The lead sounds like a really good Marshall (JCM800ish).

The amp with reverb is my favorite amp. I'll keep on experimenting with other designs - but this is the ONE amp for me.

[gingertube]

I built a "standard" from TUT5.
Powerscaled. I chnaged the Power section slightly to run a quad of 6V6.
Also modified the Fixed/Cathode bias switching to operate on a per pair basis
Similarly changed the pentode/triode switching to a per pair basis.
I mostly run it with one output pair in fixed bias pentode mode and the other pair in cathode bias triode mode.
Made my own eyelet boards but used a powerscale kit from Kevin.
Output Tranny was a 3k4 Raa 50W ouput tranny. It worked weel with the 6V6 quad.
B+ at 100% Powerscale was 350V.


My own Git Amp uses the London Power Standard Preamp but with 2 off 6SL7 in place of the 2 off 12AX7

Cheers,
Ian