"Post tweak" schematics

[George Adzich]

Dogears,

Are you saying that the only changes that you have made to your circuit are the changes you recently listed??

I thought there were some other changes with the Subbers on OD1 & OD2 and also the feedback on CL2........

Since most of us are farily well versed with the terminology, maybe a list of the component values could be added to the Excel spreadsheet that another member already posted in the schematics section.

Thanks to all,

-George

[BobW]

George,
No one is trying to hide anything here. It's just difficult to list all the values that are proven to work for all amp designs based on, for example, the Rev A schematic. What works for one may or may not work for the next. Guys like Dogears, Normster, Bob-I, Ayan, BobW, and many countless other great guys here don't all agree on strict component values. The reason is we don't all use the same transformers, filtering, B+ voltages, speakers, guitars, or play the same style. Each has their own individuality, at that's wonderful. Everyone previously mentioned has great insight and suggestions, but eventually you have to adjust your amp for your own sound. I understand you'd like to create a great amp, and ideally recreate based on spreadsheet data, but all I can suggest is to start off with a good basic design such as the REV A schematic, use suggestions generously posted here, and tweak to you own musical taste. If you have difficulty at any particular stage of the build, someone here can help you through it. Good luck with your amp build.

[pedro]

yeah, I pretty much agree - the thing is you are bound to mess with component values and bits of the topology even after you have first built to a preferred "blueprint" - thats what happended for me anyway.

That way you get to mess with latest views and advice as you go along so dont ponder too much - go with basic platform and then tune to your own circuit, iron, speakers, guitar, playing style etc.

cheers
Pedro

[llemtt]

..The reason is we don't all use the same transformers, filtering, B+ voltages, speakers, guitars, or play the same style..

I agree with Bob, apart obviously from speakers having the most huge impact on sound but that I don't consider strictly part of the amp, the OT is one of the major differentiating components. Both power bandwidth and impedance ratio really change the freq response and then this requires tweaking snubbers, coupling caps, TS,...

Guitars to me aren't definitely part of the amps btw little adjustments can make the amp more versatile for those who play different guitars, or extremely specialized for just one kind of guitar.

teo

[jaysg]

I can't speak for George, but my desire for a standard schematic is to have a fixed starting point. While clips are good things, I don't know how well my amp rates. I have ziltch to compare it too. The people who've heard it have either been facinated or relatively disinterested. [I started with the Hybrid-A schematic, but didn't have much info on cap and resistor types, so I used 716's and what I could scrounge.]

With some designs, if you meticulously follow the layout and BOM, it's going to be great - if you don't, then not so good. With the 18Watt design you can do tons of different things and the outcome will still be great. The ODS appears to be more of a framework and from the comments of people who've played the real thing, TR's, Fuch's, et al, the whole enchilada is very subjective.

Beyond that, I don't play (and can't play) like Gil, Scott, or Jack Zucker, so I'm left wondering what the right tweaks would be for a more ham-fisted player. I guess I'm more interested in Ford, Landreth, and Lindley tones. I also think that the geezer who plays lead in Michelle Branch's band sounded better on Abraxas than anytime after, including his use of Dumbles.

[stevlech]

I'm sorry if this is presumptuos, but I believe that Hybrid A and the 97 schemes are the fixed starting points we refer to. Yes, it would be cool to have modified schemes referring to Dogear's tweaks versus Glasman's tweaks versus...but I think the Baseline is in those two designs.
My $0.02

[Pete]

I believe that Hybrid A and the 97 schemes are the fixed starting points we refer to.

I would say I agree with that (noting the fact that there are a couple "mistakes" on those that have been pointed out, and I think everyone is aware of)

But don't be "misled" by the "starting point" comment. If you don't catch the "tweaking obsession" you would still have a fine amp (IMHO). I first built the 97 about 6 years ago and just played it as is for at least a year or so. Until I got a little curious and more talk/info developed.

the whole enchilada is very subjective

I would agree with that also.

good luck, have fun, stay tuned.