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Messages - Jack1962

Pages: 1 ... 14 15 [16]
Tubes and Hybrids / Re: How to wire tubes
« on: June 30, 2008, 01:46:29 PM »
go to and download the TDSL prog , it id's most tubes and isf you click on the last tab to the right it will give you links to data sheets r2 ties to pin 2 on the tube.

                                           Rock On

I think that rather than "emulate tubes", the real challenge is "get good sound", which is often (but not always) found in tube amps, without using tubes themselves. I think Mr Pritchard is a genius, has *very* good sounding amps, but he misses the point, he often tries to emulate *everything* a tube does, which is not the real problem. Someday he´ll emulate a spirally wound 6.3V heated filament, a glass envelope, a 9 pin socket, the sound of high vacuum, and that´s not really necessary. I think Runoffgroove´s approach is basically flawed: Fets do not even approach triodes, (if any, they´re closer to pentodes); they copy (should I say mimic) classic circuits, horribly biased, horribly powered, that have ten times less gain than the originals, clip radically different, (just use a scope; I´me sure they don´t), harsh, dry, ugh!!  An example of good engineering (and audibly good taste) is found in the SansAmp guys, who do not use Fets , CMOS or even diodes but do get a very acceptable sound. I agree that Op Amps (universal gain blocks) with suitable components around them, skilfully used, are one of the safe ways to go.

Lmao- I have to agree for the most part , myself I am after good tone, I use tube amps for gigs, live stuff. However,  to record I use a lot of emulation(GNX4 and Roland). It's a matter of taste I have heard SS amps that sounded great and some that sounded beyond bad, same goes for tube amps. Bottom line , most peeps are after the emulation because of the price of those tube amps.

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Tubes and Hybrids / Re: real mctube
« on: June 30, 2008, 01:32:12 PM »
has anyone built a real mctube or similar preamp? looks real cool, i like the backwards transformer for the high voltage for the tube. it seems like a better option than the starved plate designs that are out there, anyone have any thoughts or experience?

I haven't seen the diagram or this preamp , however , feeding a Xformer backwards can be dangerous(the thing can fry real easy). Mot all Xformers can be reverse feed.

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Tubes and Hybrids / Re: Are Marshall Valvestates reliable?
« on: June 30, 2008, 01:29:47 PM »
Yes , as JM said solder joints and pots can be a problem, not to cut myself out of work guy's , if your handy with a soldering iron , you can repair most of these prblems yourself, and save alot of cash, I charge $65 an hour to work on amps, and that's a competative rate here.

                                             Rcok On

Check out the circuitry in a PEavey Musician Series 400, This old amp has a rich tone that is hard to beat , and approachs the tube tone. However , this was not a tube emulation , it is just the design of the amp.

                                         Rock On

Tubes and Hybrids / Re: Are Marshall Valvestates reliable?
« on: April 14, 2008, 07:29:32 AM »
The Primary reason that I do more actual repairs on SS than tube , because the manufatures back in the early mid 80's started producing massive #'s of these amps , and pushing the the reliablity thing (any amp will last SS or Tube if not abused). The repairs I do the most are on blown preamp chips or transistors, or simply blown resistors in output stages, my favorite are the thermal sensors on the output Transistors. but it's basically because you can buy a SS amp a lot cheaper than a tube amp so there are more of them out there(right now ). However, I play thru SS amps as well, and I dig them too. It's all in what tone you want and with the amp modeling thing you don't really have to buy a $2000 amp to get that tone anymore.

                                           Rock On

Preamps and Effects / Re: So you need a preamp - here are your options
« on: April 08, 2008, 02:55:31 AM »
I have a few different setups myself , however , here is the real deal a power amp requires 1 to 2.6 volts to operate correctly. most of the new stompbox multi effect monsters(Roland , Digitech) can put out up to 2 volts , plenty to drive any good power amp.

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Tubes and Hybrids / Re: Are Marshall Valvestates reliable?
« on: April 07, 2008, 09:00:52 PM »
The Valvestats where made in the mid 90's 95 or 96 , they where not made long. I have 2 100watt heads , I have had no major problems with mine. not to rattle any chains , but Joe I work on amps everyday , and I see more Solid State than tube amps , on failures , most of the tube amps are mods.

                                     Rock On

Tubes and Hybrids / Re: Other tubes
« on: April 07, 2008, 08:55:24 PM »
50C5's are great little tubes I used them in my first tube amp build, but I would really recommend stepping up to the 6BQ5 or better known as EL84. you"ll will have to step up to 240-270volts but the difference in tone is worth it.

                                Rock On

Tubes and Hybrids / Re: adding extra gain stages
« on: April 07, 2008, 08:51:38 PM »
you may be able to get more gain if that's all your after by using different Preamp tubes , what tubes are you using?

                                    Rock On

Tubes and Hybrids / Re: 12v 12U7/12AL8 amp, have a few Q's
« on: April 07, 2008, 08:47:53 PM »
The pot would have to be in front of r5 , r5 is your bias , with a pot there when you reduce the resistance the tube will go into runaway or you  can put a pot in series with R2 making it R3.

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