Guy77 wrote: ↑Sat Jun 20, 2020 3:37 pm
Thanks for the update rootz. I was just looking at the #60 schematic and it is just as you described it 470k series resistor and then the 470k grid leak. I will have to try that combo. I have an 8meg local feedback resistor on my dry mix side, your 1meg must clean it up nicely!
Here is a little clip of mine with first no reverb and then half reverb and then full reverb, there are pauses between each change. Its on the overdrive channel.
These are beautiful sounding amps!
Thanks rootz!
Guy
ODSR_Reverb2.m4a
You have an superb sounding amp Guy. I really like the sounds you get here.
Remember about the 470k/470k combo that I ditched the 220k grid stopper all together. I'll post a schematic of this new amp here, so you can see what I did.
didit wrote: ↑Mon Jun 22, 2020 6:11 pm
Super drippy and slightly trippy.
Best .. Ian
I think this sums the reverb up pretty well! The tails of the reverb have a bit of a swirl to them and there is some shimmer. The reverb can get quite overbearing. Good thing is, you can always dial it back, but when there isn't enough reverb on an amp, you can't dial it up.
norburybrook wrote: ↑Sat Jun 20, 2020 5:59 pm
Sounds great Rootz . Plenty of reverb available there and seems to have no negative effect on the OD at all.
would be great if you could post a layout /schematic for this amp? The one thing I Miss with my ODS amps is just being able to dial in some Spring reverb. Having to lug around a dumbleator and pedals sometimes is just a PIA.
congratulations on a great build, you must be very happy.
M
This Marcus, is the exact reason I wanted an amp with reverb. I sure love reverb, but it also gives that extra bit of depth that on some occasions makes a pedalboard not necessary, at least IMHO. This reverb is still very controllable and can be just as gentle as you want it to be.
Also thank you for the kind words! Yes, I'm very happy with it. Although the differences with my previous amp seem rather small (at least, I think they are) it is a very different amp. Less snarl than my low plate 20W, but more of a growl and much bolder and more 3D.
Right before all the kids go to bed in the neighbourhood I made a short recording. I don't think the master was even touching 1 on this recording. Nevertheless, I think there is much life in the guitar sound. 62 Strat clone into the FET.
Guy77 wrote: ↑Sat Jun 20, 2020 3:37 pm
Thanks for the update rootz. I was just looking at the #60 schematic and it is just as you described it 470k series resistor and then the 470k grid leak. I will have to try that combo. I have an 8meg local feedback resistor on my dry mix side, your 1meg must clean it up nicely!
Here is a little clip of mine with first no reverb and then half reverb and then full reverb, there are pauses between each change. Its on the overdrive channel.
These are beautiful sounding amps!
Thanks rootz!
Guy
ODSR_Reverb2.m4a
You have an superb sounding amp Guy. I really like the sounds you get here.
Remember about the 470k/470k combo that I ditched the 220k grid stopper all together. I'll post a schematic of this new amp here, so you can see what I did.
Thanks rootz! I just listened to the FET input recording you did. Sounds excellent! I will need to install a FET input into my next ODSR build too.
Guy77 wrote: ↑Sat Jun 20, 2020 3:37 pm
Thanks for the update rootz. I was just looking at the #60 schematic and it is just as you described it 470k series resistor and then the 470k grid leak. I will have to try that combo. I have an 8meg local feedback resistor on my dry mix side, your 1meg must clean it up nicely!
Here is a little clip of mine with first no reverb and then half reverb and then full reverb, there are pauses between each change. Its on the overdrive channel.
These are beautiful sounding amps!
Thanks rootz!
Guy
ODSR_Reverb2.m4a
You have an superb sounding amp Guy. I really like the sounds you get here.
Remember about the 470k/470k combo that I ditched the 220k grid stopper all together. I'll post a schematic of this new amp here, so you can see what I did.
Thanks rootz! I just listened to the FET input recording you did. Sounds excellent! I will need to install a FET input into my next ODSR build too.
Goodnight !
Guy
Guy,
i built about 4 ODS without FET before I gave it a go. I must say I have 2 now with FET and they're both using the FET on a relay using MArtin Manning's great layout in the files section. IMHO it's THE best way as you have a controllable clean boost available to you at all times and the FET gain is just a pot in the FET jack input.
I have it on a 70's second gen #40 and a bluesmaster HRM and it works great on both amps.
I think I made a mistake or at least incorporated a design flaw of sorts in my design. The dry signal mixer didn't have the headroom I wanted it to have, thus potentially clipping or at least compressing pretty heavily when in clean, FET and PAB. I confirmed it with the scope. I switched back to the tried and tested Wonderland dry mixer setup. Will clip too, but a bit more gracefully. I would clip in a Wonderland too of course when driven hard.
I attached a schematic of the amp in it's current, updated form. You recognise it by the 1meg 68k voltage divider before the dry mixer.
The other schematic is the outdated version of the dry mixer. The skyline stack only lived in sim, never actually had that in the amp.
You do not have the required permissions to view the files attached to this post.
I love happy accidents. Sounds like a spring circuit I'd like to try.
I'll have to go look at the Wonderland again... I had been studying it from a bass players view.
"Education is what you're left with after you have forgotten what you have learned" - Enzo
Interesting Rootz. I experimented with this on my build and ended up with a 1M /150K . The 2 rock has a switch there , the gain structure switch with 3 values. DId you start with a 470K? am I looking at the right thing?
I found the 1M/68 just killed too much volume even on a 100w amp.
Funny I had this amp out yesterday in the studio and was thinking about adding a switchable FET and perhaps a gain structure switch or pot
Hi Marcus on my ODSR I went with 470k/68k divider ( I also had a 220k on the mixer tube dry side after the divider just like the JM has). I increased the 68k to 150k and did not notice the same volume increase I got from doing that to the JM ( this may be because the amp has an extra Level control after the mixer tube ) and so I left it 470k/68k.
My version was the early version that rootz built in this post here.
I did not test the new setup yet, that’s something for tonight. I don’t think you actually need a gain structure switch to be able to drive the pi and output tubes to clipping. How much do you need at the pi entrance for full volume? 4V peak? 8V peak? I think you can easily get there with 1meg —> 68k.
In the top schematic you can see a 470k/470k voltage divider and a 1meg feedback resistor. A very clean stage, but not the amount of head room I wanted it to have.
rootz wrote: ↑Wed Jun 24, 2020 5:04 pm
I did not test the new setup yet, that’s something for tonight. I don’t think you actually need a gain structure switch to be able to drive the pi and output tubes to clipping. How much do you need at the pi entrance for full volume? 4V peak? 8V peak? I think you can easily get there with 1meg —> 68k.
In the top schematic you can see a 470k/470k voltage divider and a 1meg feedback resistor. A very clean stage, but not the amount of head room I wanted it to have.
on the wonderland 68k was no where near hitting a peak, but that's a different circuit from this I think as it's got 5 pre amp tubes. a 1M-68k voltage divider if you put in 10v will output 0.636 v, that's a huge drop. A few pro builders told me when I built my JM/SSS it was like having a master volume on 2 and questioned the schematic/layout.
IIRC any 2 resistors of the same value in a voltage divider give you a drop of 50% so your 470/470 would output 5v if 10v was input which is 10 x the 68k/1M gain.
this topic has got me to fire up the soldering iron though Rootz and strat tweaking my SSS/JM
Shall I adjust the pcb files to through plates eyelets? So no real eyelet, just a 2mm plated hole. I could also adjust for 3.2mm holes for eyelets, but that seems to be redundant.
Hi Rootz. In the end did you prefer not having the Level control in the back (2nd master vol) of the amp and just the one Master vol after the tweed mixer?
On mine I like to ride the Level control in the back as high as I can. About 3 o'clock with a 1Meg Audio pot. I can see why 2Rock uses a 250k pot here since after about 350k the amp gets a little noisy (too much signal hitting the power tubes).
and seems to have no negative effect on the OD at all.
