"1959 Bassman" amp sim & mp3's

[MartyMart]

http://www.pbase.com/image/56898767/original

My "Bassboy '59" amp sim .....

Here's the schematic, with a veroboard layout to follow tomorrow.
Based on some original '59 Bassman schematics, narrow box/Wide box and
"TV" style versions, so isn't a direct "lift" from any single amp
I've omitted the tone stack, but the original or your "pet stack" can be inserted
between Q3 and Q4 quite easily.
I found the tone to be full and bright enough as-is and compared quite well with a
mid sixties version that a friend owns,( eq set about flat ) .. in fact he now wants one of these, so it can't
have been too bad !!
Any comments/improvements etc are welcome and please excuse any "glaring errors"
this is a fine sounding and fully working sim, albeit not "an original" and sounds fantastic
when boosted with a TS-9 pedal ( found a use for it now !!)

I will add some sound samples and vero layout to this thread, a.s.a.p

NOTE: Please study carefully the link from Q1 to Q3 via the 2 100k resistors and the connection to
Q3's gate and link to drain  !!!  Q3 drain needs to be at around 6.5v for correct operation !

Enjoy,

Marty.

[Bernardduur]

Nice one! Maybe I put it in the same pedal as my Flipster and switch between them

[barret77]

...and the crowd shouts in unison "sound clip! sound clip! sound clip!" 

[MartyMart]

As requested, recorded with JMP-1 clean and flat no extras, reverb on TS-9 sample.

Clean:
http://aronnelson.com/userfiles/59Bassboyclean.mp3

Half gain:
http://aronnelson.com/userfiles/50bassboyhalf.mp3

Full gain:
http://aronnelson.com/userfiles/59Bassboyfull.mp3

Pushed a bit with a TS-9:
http://aronnelson.com/userfiles/59%20pushed%20TS9.mp3

Excuse the crappy playing .... I'm NOT  SRV !!!

MM

[PenPen]

Very cool. You beat me to this. I was planning one day to make a SS Bassman replica in the chassis of an old crappy Crate SS amp I have. Looks like I now have a schem for the preamp already! Thanks for posting.

[wampcat1]

Hey Marty, is that your amp reverb or a plug-in? If it's a plug in, which one is it!!?? Love it!

(sorry for the OT) 

[MartyMart]

Hey Marty, is that your amp reverb or a plug-in? If it's a plug in, which one is it!!?? Love it!

(sorry for the OT) 

Glad that you like my "reverb" demo Brian ..... ... why do I bother ?

It's just the Platinum reverb in Logic Pro7, small room I think ...

MM

[scaesic]

how was this recorded?
dont suppose theres any chance you could put it into a power amp and record it through a speaker?

[cx_deluxe]

I was hoping someone would sim up one of these.  The clips sound great.  I really like the clean setting.  The half gain sounds good too, but there was something about the full gain that I didn't like -- too much transistory distortion?  I'm having trouble describing it.  As if the mids were coming through an Atari?  Kinda like a psychedelic era distortion effect?  Maybe this is EXACTLY what it is supposed to do, its just not my thing.  Could be.  Oddly enough, I thought it sounded better agian with the tubescreamer driving it.  Could be because the combination is driving the tubes in your preamp?  Not sure.  Again, I really like the clean setting and I think I'll probably build one on its merits alone.  Nice work!

[MartyMart]

I was hoping someone would sim up one of these.  The clips sound great.  I really like the clean setting.  The half gain sounds good too, but there was something about the full gain that I didn't like -- too much transistory distortion?  I'm having trouble describing it.  As if the mids were coming through an Atari?  Kinda like a psychedelic era distortion effect?  Maybe this is EXACTLY what it is supposed to do, its just not my thing.  Could be.  Oddly enough, I thought it sounded better agian with the tubescreamer driving it.  Could be because the combination is driving the tubes in your preamp?  Not sure.  Again, I really like the clean setting and I think I'll probably build one on its merits alone.  Nice work!

The recordings were carefully made, so as NOT to drive the JMP-1 at all 
The tone is all sim and sim + TS-9.
JMP-1 does impart its own "tone" on stuff ( which I'm not so pleased about ) but its a quick way
to record clips !
Through my  valve amps it sounds better, less mush and more mids ( speakers ? )
It can get slightly cleaner, with gtr/bass backed off a tiny bit ...

Cheers,
Marty.

[jmusser]

Wow Marty, are you the next ROG? I liked the full gain setting really well. The clean setting was nice and clean. I didn't care for it as much at the half setting or with the Tube Screamer. Of course, that's all personal preference. Nice Job! I still have your last project to build.

[barret77]

wow, really nice. Damn, one more build to the queue...

[Eirik]

Nice one Marty! Again!
Does anyone have an opinion of what the Doug Hammond/ROG-style amps would be like, using a starved 12ax7 or sim. for the first stage? I suppose running at 18V would be fine.
Would it make any difference at all, or would it be just a waste of time and space? My thought is just to achieve that nice input tube breakup.
I would of course try it myself, but I have so many builds to do I'd rather spend my time with them than wasting time experimenting with the tube idea if no one think it would make  a difference.

[Paul Marossy]

How much insertion loss do you get when you add a tonestack to it? Is it just a matter of tweaking drain values until it's all good?

[wampcat1]

Hey Marty, is that your amp reverb or a plug-in? If it's a plug in, which one is it!!?? Love it!

(sorry for the OT) 

Glad that you like my "reverb" demo Brian ..... ... why do I bother ?

It's just the Platinum reverb in Logic Pro7, small room I think ...

MM

hehe!  Sorry, I didn't mean for it to sound that way!
The circuit sounds great too, I'm still jonesing to build that classic 30 fet sim!!!

Take care,
Brian

[MartyMart]

How much insertion loss do you get when you add a tonestack to it? Is it just a matter of tweaking drain values until it's all good?

I'll draw one up with it in if you like, you dont loose much at all, this has a TON of volume !
The samples were recorded with master vol at about 9 o'clock !!
( you may need to pull down the output a bit with a resistor )
It just seemed to sound "right" without a tonestack

MM.

[Paul Marossy]

you dont loose much at all, this has a TON of volume !

From your notes on the schematic, I would have thought so. Just thought I'd check. 

[MartyMart]

Nice one Marty! Again!
Does anyone have an opinion of what the Doug Hammond/ROG-style amps would be like, using a starved 12ax7 or sim. for the first stage? I suppose running at 18V would be fine.
Would it make any difference at all, or would it be just a waste of time and space? My thought is just to achieve that nice input tube breakup.
I would of course try it myself, but I have so many builds to do I'd rather spend my time with them than wasting time experimenting with the tube idea if no one think it would make  a difference.

With this circuit, I guess that using one 12AX7 for Q1/Q2 position might sound nice ....
but then, you may as well build it all "as the original schematic" !!
Then plug that into a power amp !
Dont forget, these emulations are a "simulation" of tubes run at 200-300v  Not a starved plate
version, so it probably wont sound as good, even with 12AX7's ... if they are just "light bulbs" !!

I can tell you that my friend with the '60's Bassman was quite "gob smacked" at how close the
sound was 
MM

[skyhigh]

Nice one Marty! Again!
Does anyone have an opinion of what the Doug Hammond/ROG-style amps would be like, using a starved 12ax7 or sim. for the first stage? I suppose running at 18V would be fine.
Would it make any difference at all, or would it be just a waste of time and space? My thought is just to achieve that nice input tube breakup.
I would of course try it myself, but I have so many builds to do I'd rather spend my time with them than wasting time experimenting with the tube idea if no one think it would make  a difference.

With this circuit, I guess that using one 12AX7 for Q1/Q2 position might sound nice ....
but then, you may as well build it all "as the original schematic" !!
Then plug that into a power amp !
Dont forget, these emulations are a "simulation" of tubes run at 200-300v  Not a starved plate
version, so it probably wont sound as good, even with 12AX7's ... if they are just "light bulbs" !!

I can tell you that my friend with the '60's Bassman was quite "gob smacked" at how close the
sound was 
MM

maybe a Fetzer Valve construction could do some good?? 

http://www.runoffgroove.com/fetzervalve.html

[EdJ]

I like the samples.
They remind me of a Randall amp i once had.
I loved that amp but it went in flames when the rehearsel room burned down.
Still haven`t built the vulcan fet though:)

Greetings,Ed