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Help to chose a practice amp (1W and less) to make
Help to chose a practice amp (1W and less) to make
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Old 18th September 2019, 07:43 AM   #11
Printer2 is offline Printer2  Canada
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Just thought I should mention this schematic.
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Last edited by Printer2; 18th September 2019 at 07:49 AM.
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Old 18th September 2019, 03:25 PM   #12
tristanc is offline tristanc  United Kingdom
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Default Sound clips

Managed to take a quick sound clip. Close mic'd using a Sony lapel condensor mic, into Garageband via a preamp thing. No EQ, tiny bit of compression. So not ideal and I'm no expert, but you get the idea.

Amp settings given below - MV altered a bit to keep it at conversation level - with the scale control at 0, so mW output. Any changes within each section due to guitar (SG-style twin humbucker) controls. Excuse the crap playing.

https://www.tristancollins.me/ax84/M...neerStudio.mp3

0 - 1'14" Gain 6/10, Presence 9/10, Middle 2/10, Tilt 6/10, Reverb 2/10, Scale 0/10
1'14" - 1'54" Gain 8/10
1'45" - 3'10" Gain 6/10, riding volume control + pickups
3'10" - 4'02" Gain 8/10, riding volume control
4'02" - end Plexi/October channel, Dark 4/10, Bright 6/10
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Old 18th September 2019, 04:05 PM   #13
tristanc is offline tristanc  United Kingdom
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And another of the FireFly: https://www.tristancollins.me/ax84/M...io/Firefly.mp3

Gain 5/10 then 8/10. Mid 3/10, Tilt 6/10.

Wow, what an amp. My favourite of the ones I've built. The volume control on the guitar is so usable, from 2 or 3 to 10. Whereas the Studio is useful from 7 to 10. Might have to investigate with the scope why that is so. Might be lower preamp voltages. Or could be the valves - using proper NOS Mulllards in the FireFly...
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Old 18th September 2019, 04:24 PM   #14
PKI is offline PKI  United States
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Help to chose a practice amp (1W and less) to make
Quote:
Originally Posted by tristanc View Post
Managed to take a quick sound clip. <snip>
Thank you so much I appreciate it a lot! For my needs Plexi/October channel is what I need! :-)
Looking at the voltages... I have a bunch of NOS Russian 6sn7 which I'd like to use, but they do not take more than 350V, so is it possible to drop B+ to something like 330? What Bias should I have then?

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Originally Posted by Printer2 View Post
Just thought I should mention this schematic.
Thank you! This one sounds amazing as well!

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Originally Posted by tristanc View Post
And another of the FireFly: <snip>
So you like FF better?!
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Old 19th September 2019, 02:11 AM   #15
Printer2 is offline Printer2  Canada
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I wonder if a simple amp might do? I did a 6AK6 5E3 Deluxe amp before but if you get rid of the other channel and then use a Mosfet for the phase inverter then it is a two tube amp. Only a volume and tone knob. With PS components of course. I have never really been interested in a 12AU7 output amp, may just have to slap one together to see what it is like..

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Last edited by Printer2; 19th September 2019 at 02:14 AM.
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Old 19th September 2019, 03:54 AM   #16
PKI is offline PKI  United States
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Help to chose a practice amp (1W and less) to make
that is indeed pretty simple and elegant one... hm...You are putting me on a slippery slope... from making a simple amp and start practicing more to trying different amps :-) That DYI itch... I can quit anytime! hehe :-)
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Old 19th September 2019, 10:50 AM   #17
cobretti is offline cobretti  United States
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I like the October style amp a lot but what are those 6SN7GTB output tubes? Can they be replaced with something more common?
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Old 19th September 2019, 11:37 AM   #18
tristanc is offline tristanc  United Kingdom
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Quote:
Originally Posted by PKI View Post
Thank you so much I appreciate it a lot! For my needs Plexi/October channel is what I need! :-)
Then just go with an October Studio. Loads of them built, so can't be that bad!
Quote:
Looking at the voltages... I have a bunch of NOS Russian 6sn7 which I'd like to use, but they do not take more than 350V, so is it possible to drop B+ to something like 330? What Bias should I have then?
If you drop the voltage it should still be OK - just less headroom / output. The GTB are higher voltage versions.
Quote:
So you like FF better?!
That combination just seems to work incredibly well - the 12AU7 self-split output and Merlin's High Gain (with tweaks). It could be the lower voltages but it sounds great to me at low levels - better than my Mutineer. Getting to the bottom of why - I tweaked the values to match between them as far as possible and the Mutineer sounds a bit better now, but still not as 'fun' as the FF. But I think the large level of NFB and higher power level are playing tricks. I'm thinking if I could test the Mutineer at higher output levels (ie, get the output tubes working a bit) then they'd get closer. Simulations show the the two should be fairly similar in response...
Quote:
Originally Posted by cobretti View Post
I like the October style amp a lot but what are those 6SN7GTB output tubes? Can they be replaced with something more common?
Can always use a 12AU7 - that was an option listed somewhere. But not sure if the level needed to drive them would be even lower than the 6SN7...
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Old 19th September 2019, 02:09 PM   #19
PKI is offline PKI  United States
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Help to chose a practice amp (1W and less) to make
What if you combine plexi preamp with the FF output?
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Old 19th September 2019, 06:43 PM   #20
PKI is offline PKI  United States
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Help to chose a practice amp (1W and less) to make
The reason I am asking is that from all the clips you posted I figured that I do not like that type of hi-gain sound. I prefer all the amps with mid-gain settings. Also the idea of modern/vintage switch is very appealing on the october pre :-)
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