4th Generation 100 watt
Moderators: pompeiisneaks, Colossal
4th Generation 100 watt
It passed the flame test, all voltages spot on. And it sounds great. And the deep switch is good.
well balanced amp from clean to overdrive and fet. Bias -32.5 6L6GC quad made in USA.
Thanks to all, Steve.
well balanced amp from clean to overdrive and fet. Bias -32.5 6L6GC quad made in USA.
Thanks to all, Steve.
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Last edited by 67plexi on Mon Dec 17, 2012 11:36 pm, edited 1 time in total.
- LeftyStrat
- Posts: 3114
- Joined: Fri Jan 14, 2005 6:58 pm
- Location: Marietta, SC, but my heart and two of my kids are in Seattle, WA
Re: 4th Generation 100 watt
Awesome! We need clips. I'd love to hear the classic preamp with 100 watt power amp. What kind of filtering in the power supply?
It's never too late to have a happy childhood.
Re: 4th Generation 100 watt
Nice, my favorite amp circuit! Did you add a boost? I notice a second relay on there.
---------
Bryan
Bryan
Re: 4th Generation 100 watt
Thanks' the first filter stage is 300uf @ 500v x2 = 150uf @ 1000v.
Yes it has a PAB, and 100k overdrive ratio pot. The deep switch shines using the fet with a acoustic guitar. As far as clips go it will take time. I need to build a combo or a head box next.
Steve.
Yes it has a PAB, and 100k overdrive ratio pot. The deep switch shines using the fet with a acoustic guitar. As far as clips go it will take time. I need to build a combo or a head box next.
Steve.
Re: 4th Generation 100 watt
One more photo.
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Re: 4th Generation 100 watt
Nice to see you building again! Looks like a cool amp. Is the overdrive ratio the same as the #60 ODSR?
Eric
Eric
Re: 4th Generation 100 watt
Eric, On ODSR I used 250k OD ratio and 2MEG2 for the clean ratio
#60 is a killer slide guitar amp it cuts through the mix like no other ODS amp.
Steve.
#60 is a killer slide guitar amp it cuts through the mix like no other ODS amp.
Steve.
Re: 4th Generation 100 watt
Looks nice Steve.
Can you tell us about the OD trim pot on the back
Can you tell us about the OD trim pot on the back
Tom
Don't let that smoke out!
Don't let that smoke out!
Re: 4th Generation 100 watt
Tom, Thank you, It's just a 100k CTS pot to fine tune the overdrive.
Re: 4th Generation 100 watt
Just to avoid misunderstandings:LeftyStrat wrote:I'd love to hear the classic preamp with 100 watt power amp.
Most of the original 3rd generation ODS amps don't have a "classic" tone stack but the "pre-classic" tone stack documented in this layout: http://ampgarage.com/forum/download/file.php?id=14344
The "classic" tone stack - documented in this layout: http://ampgarage.com/forum/download/file.php?id=14346 - you'll find in most of the transition generation and 4th generation ODS amps.
AFAIK the transition generation ODSR #0060 (originally in a head cabinet and not yet in Bonnie Raitt's combo cabinet) hasn't originally been built with a 3rd generation "pre-classic" tone stack and a 3rd generation "pre-standard" OD circuit, but has originally been built with a "classic" tone stack and a "standard" OD circuit. Later AFAIK it has been updated to "skyline" specs with some special tweaks. As beeing owned by Jackson Browne and used in his studio AFAIK #0060 is the result of a constantly ongoing updating process anyway.
Cheers,
Max
Re: 4th Generation 100 watt
Max I'm no Dumble expert this new build is a pre skyline eq.
To clear up the confusion #060 ODSR is a older build not this one.
Thanks' for your input, Steve.
To clear up the confusion #060 ODSR is a older build not this one.
Thanks' for your input, Steve.
Re: 4th Generation 100 watt
You should have tinned your copper bus bar - looks way cooler!
Last edited by odourboy on Fri Dec 14, 2012 2:15 am, edited 1 time in total.
"Let's face it, the non HRMs are easier to play, there, I've said it." - Gil Ayan... AND HE"S IN GOOD COMPANY!
Black chassis' availble: http://cepedals.com/Dumble-Style-Chassis.html
Black chassis' availble: http://cepedals.com/Dumble-Style-Chassis.html
Re: 4th Generation 100 watt
Good one thanks.
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- LeftyStrat
- Posts: 3114
- Joined: Fri Jan 14, 2005 6:58 pm
- Location: Marietta, SC, but my heart and two of my kids are in Seattle, WA
Re: 4th Generation 100 watt
Max wrote: Just to avoid misunderstandings:
Most of the original 3rd generation ODS amps don't have a "classic" tone stack but the "pre-classic" tone stack documented in this layout: http://ampgarage.com/forum/download/file.php?id=14344
The "classic" tone stack - documented in this layout: http://ampgarage.com/forum/download/file.php?id=14346 - you'll find in most of the transition generation and 4th generation ODS amps.
AFAIK the transition generation ODSR #0060 (originally in a head cabinet and not yet in Bonnie Raitt's combo cabinet) hasn't originally been built with a 3rd generation "pre-classic" tone stack and a 3rd generation "pre-standard" OD circuit, but has originally been built with a "classic" tone stack and a "standard" OD circuit. Later AFAIK it has been updated to "skyline" specs with some special tweaks. As beeing owned by Jackson Browne and used in his studio AFAIK #0060 is the result of a constantly ongoing updating process anyway.
Cheers,
Max
Still trying to understand the terminology.
pre-classic tone stack: 50 watt amps
classic tone stack: 100 watt amps, low plate (some, like #124 were later modified to skinner).
skyliner: 100 watt amps, high plates
Is this correct?
It's never too late to have a happy childhood.
Re: 4th Generation 100 watt
The tonestacks are the EQ circuits and have nothing to do with output power.pre-classic tone stack: 50 watt amps
classic tone stack: 100 watt amps, low plate (some, like #124 were later modified to skinner).
skyliner: 100 watt amps, high plates
2nd generation has a 100k slope resistor, caps are 510pf/.01uf/.1uf
and 500k linear/250kAudio/1M audio pots
3rd generation is similar but with a 250k Audio treble pot
Classic tonestack has 100k slope, 330pf/.047/.1 uf caps
250k Audio/100k Linear/250k Audio pots
Skyliner has 150k slope, 2200-500pf/.01/.1 uf caps
250k Linear/250k Audio/500k Audio pots
There is more to it and there are variations, but these values are common amongst several known amps.
I hope this helps.