Another Tweddle Dee !

[fred.violleau]

Here is a link to the video on YouTube
Fred.

[pompeiisneaks]

Very nice! I gave it the youtube link treatment

~Phil

[fred.violleau]

Thanks for the upgrade Phil!

Fred.

[xtian]

Montreal has the blues! Very nice, Fred!

Is the compression due to a pedal, phone, or amp?

[Colossal]

Hi Fred,

Sounds really good. What speaker(s) did you use for that demo?

[norburybrook]

Fred,


Just seen this clip.

It's nice to put a face to a name at last


Sounds killer man, is that the amp cascaded? I might have to look into this as some extra gain lower down in the volume would be useful in the studio and add an extra level.

I Know it's not what Dumble did but hey, it's why were here, to experiment.

I think the SS rectification will make a difference too as these amps get pushed a lot.


M

[didit]

Hello Fred --

Appreciate your youtube post. Well played. Definitely inspiring a reexamination of my 5E3 doubts. Also now curious about cascading of preamps.

Best .. Ian

[fred.violleau]

Is the compression due to a pedal, phone, or amp?

Xtian, the compression is mostly happening on the amp. The combination of NFB choice and the 2 channels cascading adds a lot of diversity to the mix.
The phone may compress a bit because volume is quite loud in a small room although I was not pushing the amp (chan1 3'o clock, chan2 noon, tone on 10 and master at 3). It's been a while since I played in a band situation, but an amp like makes the urge for it !

What speaker did I use ?
@colossal, I played the amp in 2 x12 loaded with WSG ET90. I sounds good but it feels like an amp like this sounds better on less sensitive speakers (IE Celestions than EVM12L). They seem to fade away the edgeness of the raw overdrive and add nice mid tones to it. I will try to capture the difference, it is quite noticeable. Tried it with 2x10s (from the prosonic) and I loved it. Glad you liked it, thanks for the kind words!

@Marcus, Glad you liked it too! I really like the cascading ability as it allows the amp to get into Marshall territories, almost 80s heavy metal stuff when pushed to the extreme. I can dial the same tone on the channel 2 (bright channel), with a bit less low end. But I will change the coupling Cap on Chan 1, way too much bass on its own and when cascading. I am exploring other options. I would love to be able to get a great clean sound on channel 1, and cascade it into chan 2 to get a grittier tone.

As for the SS rectification, I cannot tell, although on my previous build, I tried both (SS and tuber rect.) and since voltages are not that far apart, I don't get that much difference in the sound with a GZ34. So with my next tube order I will get a 5Y3 to see if it makes such a difference. It is drastic on my Prosonic, and I cannot play with the SS rectifier...

Thanks Ian, reading all these posts here on the forum are what keeps me going at experimenting as well!

I will try to build the head cab this weekend, and see if I can swap the OT leads and try something different for the coupling cap.
Any suggestion is welcomed !

Fred.

[fred.violleau]

Been busy this weekend, building the head for this little fella!
I wish I had better tools so I can make woodworking easier...
Most compact amp ever on my stack, but not the least!

20200518_195840.jpg

I will use some shellac to give it a nice brownish color, and I will need to order a few wood screws to attach the corners and waiting for the faceplates to arrive!

I settled on a .005 uf for the coupling cap after going through multiples schematics, this should work and help me tune channel one!

Did not get the chance to get into soldering stuff, but I will this week probably.

Cheers!

Fred.

[fred.violleau]

Alright, swapped the OT primaries and it fixed the NFB issue, thanks Phil!
I swapped the .02uf coupling cap on channel 1 to a .005uf and it really improved the bass issue!

The amp is quite versatile, and would probably be a great asset in any studio.
From clean sound, to bold on the edge of breakup, into mild overdrive to compressed hard rock without loosing clarity!

I am very happy with this build as it stands now!

Fred.

[norburybrook]

Alright, swapped the OT primaries and it fixed the NFB issue, thanks Phil!
I swapped the .02uf coupling cap on channel 1 to a .005uf and it really improved the bass issue!

The amp is quite versatile, and would probably be a great asset in any studio.
From clean sound, to bold on the edge of breakup, into mild overdrive to compressed hard rock without loosing clarity!

I am very happy with this build as it stands now!

Fred.

Fred,

I'm going to have a go at mine soon and try the cascading channels, with the switch you can have both ways so nothing to lose and everything to gain.



M

[xtian]

cascading channels...everything to gain

I see what you did there...

[fred.violleau]

@Marcus indeed, have fun!

Fred.

[norburybrook]

@Marcus indeed, have fun!

Fred.

Fred,

Well I did it

Not as much gain as I thought it would have but it's nice. I had a to make up a resistor chain as I didn't have a 680k so ended up with 640k not sure if that makes less gain or more than 680???

Did you use a 470k grid stopper to the P.I? Did you fit a master volume instead? that might be a better idea.... could you fit a 500k pot instead of the 680k resistor as a kind of trim? just thinking aloud here.

Anyway here's a loop I made this morning with it.

tweedle Dee with Cascade switch.

https://www.youtube.com/watch?v=_Lxn3gPn85M

[martin manning]

Sounds great Marcus! Are your coupling caps per the original Tweedle or have you adjusted them? The 680k is (should be) before the 1M grid resistor so using 640k will put a little more signal into the second stage, not much difference, really.

The Schematic at the beginning of this thread is not correct in the speaker connections, maybe that could be fixed up. NFB should come from the hot side, and the speaker jacks are just the standard Fender arrangement where the extension speaker is paralleled with the main.