Search found 1839 matches

by roberto
Fri Sep 19, 2008 9:21 am
Forum: Trainwreck Discussion
Topic: resistor near the vol pot
Replies: 3
Views: 1122

Re: resistor near the vol pot

They are from 820R to 470k. They reduce blocking distortion and acts like low pass filter (they roll off the higher frequencies) due to the miller effect of the next triode.
by roberto
Fri Sep 19, 2008 1:06 am
Forum: Trainwreck Discussion
Topic: a trainwreck preamp inside a plexi spec
Replies: 15
Views: 4913

Re: a trainwreck preamp inside a plexi spec

Rockstah, great sample!! I've posted an idea about trainwrecking a 1959 on MetroAmp and a single tone pot version here about last may, but never had time to try them because I'm on retroengineering a SRV SLO. glad to see you've got the same idea and you have realized it! What about power supply? Wha...
by roberto
Fri Sep 19, 2008 12:48 am
Forum: Technical Discussion
Topic: cap identification help
Replies: 1
Views: 642

Re: cap identification help

Hi rockstah, 030K0 in philips caps stand for a kind of E-caps, not the value.
by roberto
Sat May 17, 2008 7:06 pm
Forum: Trainwreck Discussion
Topic: trainwreck highpass filter
Replies: 4
Views: 1178

Re: trainwreck highpass filter

Changing from 150k to 33k change the gain of the 2nd stage, also if you scale up the capacitor to say 1n to 4n7. This is due to the fact that the triode can't load 33k as it should do with 1M load, and so it changes the way it sounds. Have you tried some different caps in parallel on this coupling s...
by roberto
Tue Apr 22, 2008 10:05 pm
Forum: Garage Talk
Topic: 13,000$Can. plug and play, no noise, 200 sold in the U.S.A.
Replies: 51
Views: 8306

Re: 13,000$Can. plug and play, no noise, 200 sold in the U.S.A.

Just an update on Pantone: http://www.youtube.com/watch?v=hjLqFSlHWcs http://www.youtube.com/watch?v=H4MIxhgZoUE http://www.youtube.com/watch?v=adqtuj_kGC8 http://www.youtube.com/watch?v=4ath9fodgVw http://www.youtube.com/watch?v=RbXzg8j7pMU http://www.youtube.com/watch?v=3NeWtUSamG0 http://www.yout...
by roberto
Tue Apr 22, 2008 12:21 pm
Forum: Garage Talk
Topic: 13,000$Can. plug and play, no noise, 200 sold in the U.S.A.
Replies: 51
Views: 8306

Re: 13,000$Can. plug and play, no noise, 200 sold in the U.S.A.

Has anyone tried the Pantone system on some engines?
Here in Europe fuel may cost 8,5 $/gallon, so we take care..
by roberto
Mon Apr 21, 2008 10:16 pm
Forum: Technical Discussion
Topic: Marshall tone stack w/o cathode follower?
Replies: 5
Views: 3005

Re: Marshall tone stack w/o cathode follower?

EDIT:
Double post. See differencies in attached file.
by roberto
Mon Apr 21, 2008 10:14 pm
Forum: Technical Discussion
Topic: Marshall tone stack w/o cathode follower?
Replies: 5
Views: 3005

Re: Marshall tone stack w/o cathode follower?

Take care about the fact that a marshall EQ w/o a CF reacts differently. You have less mids and highs (or more mid-lows if you prefer). You can see this changing Zsrc to 68k on Duncan simulator. It sound more like an Engl. It should be better to raise the slope and maybe lower the treble cap (33k ki...
by roberto
Sun Apr 13, 2008 12:15 pm
Forum: Technical Discussion
Topic: Suppliers
Replies: 8
Views: 4484

Re: Suppliers

A great trafo maker with cheapest prices ever:
http://www.maddistribution.it/index.php ... b6f6f440ed
by roberto
Sun Apr 13, 2008 12:12 pm
Forum: Technical Discussion
Topic: Choice of small value caps
Replies: 9
Views: 2252

Re: Choice of small value caps

Ceramic are not linear, and this could be used to "marshallize" the sound, specially if you go near the declared voltage. For a more linear sound I use Wima caps. SM usually for cleans (or smooth leads) and only if the signal is passing throught, not for grounding or anode bypass.
by roberto
Wed Apr 09, 2008 4:16 pm
Forum: Technical Discussion
Topic: Why 100 Watts?
Replies: 54
Views: 11357

Re: Why 100 Watts?

I was talking about same cab configuration, same preamp, only supply and trafos changed. I think also other people mean the same. I don't need to crank a 100w to hear my guitar onstage. My 2channel 11W SE head is enought, and cuts the mix very well, but the 100w is wider and fuller, and sometimes I ...
by roberto
Wed Apr 09, 2008 12:34 pm
Forum: Technical Discussion
Topic: Need comments on schematic
Replies: 5
Views: 1305

Re: Need comments on schematic

Hi Rut,
V1B lacks of cathode biasing resistor.
The point in which you put reverb is a classical fender, it should work!
by roberto
Wed Apr 09, 2008 12:26 pm
Forum: Technical Discussion
Topic: Why 100 Watts?
Replies: 54
Views: 11357

Re: Why 100 Watts?

IMHO a big difference is done by power supply and trafo out. The first makes the amp more dynamic at low volume setting, the latter is well explained by AndyLeBlanc (also more iron than 50w OT).
by roberto
Wed Apr 09, 2008 12:10 pm
Forum: Technical Discussion
Topic: Hi-Gain Circuit - Affect of a lower value gain pot
Replies: 7
Views: 1856

Re: Hi-Gain Circuit - Affect of a lower value gain pot

The cap to ground on gain pots is a way to have multiple positive effects: at lower gain settings it has quite no influence on the sound, on middle to higher settings it stops squealing highs like a grid stopper, but without the hard-sound of stoppers at low gain settings. PS freq rolls-off on halfw...
by roberto
Fri Feb 01, 2008 7:46 pm
Forum: Trainwreck Discussion
Topic: Ceriatone Express Chassis Dimensions?
Replies: 3
Views: 1425

Re: Ceriatone Express Chassis Dimensions?

Only 8" deep? I've 50w OT and PT that are 102x115mm and 82x100mm.
82 + 115 = 197mm = 7"3/4. Do you think they fit the chassis?