Morning Glory

[Kipper4]

Has anyone built the morning glory please.
heres a link to the schemo i've seen

http://music.codydeschenes.com/wp-content/uploads/2013/05/JHS-Morning-Glory-Schematic.png

Sounds intresting

[GGBB]

I'm building one now - well a Marshall BluesBreaker / King of Tone actually.  Circuit board is populated - just needs offboard components and enclosure.  The Morning Glory is just a BluesBreaker with a couple of very slight changes and an output JFET buffer.  Not sure what the JFET does sound wise.  They also use a hi-fi op-amp.  Otherwise nearly identical to the BluesBreaker.  I like the BB and it's spawn a lot.  Favourite (based on audio clips) is the CMAT Mods Butah.

[Gus]

With a 1 meg ohm input resistor I would use a fet input opamp
I would use a silicon NPN transistor stage instead of a JFET

[Jopn]

I've built it based on the tagboardeffects vero and absolutely love it.  Highly recommend it.

[Kipper4]

This one Is going on the list.
Gus I find this intresting. Would i have to change much apart from the op amp and input resistor?
I'm certain i can find an NPN transistor buffer to tag in as an output buffer.
Thanks for the replys guys

[GGBB]

This one Is going on the list.
Gus I find this intresting. Would i have to change much apart from the op amp and input resistor?
I'm certain i can find an NPN transistor buffer to tag in as an output buffer.
Thanks for the replys guys

I think what Gus is saying is to use a FET input opamp such as the TL072 instead of the LM833N.  TL072 is a pretty common choice for BB overdrives - that's what I'll be using (to start with anyway).  As far as the output stage goes, I'd leave it out first before trying to change it.  It appears to serve no other purpose than to give a bit of a boost for a higher max output level.  The stock BB circuit doesn't really need an output buffer.  Leave out everything right of C13; change R14 to a 100K pot and move C13 to its wiper - output is the other end of C13; put back 1M R102 at output to ground.  You could also increase C13 to 1u film.

[Jopn]

Just another note, I found the switch (hi cut, I think??) to be fairly subtle to my ears.  It may be worth socketing that cap or playing with it on a breadboard.  If I end up rehousing it, I'll probably just choose a setting and hard wire it rather than include the switch.

[Kipper4]

Brilliant guys thats a big help.
I'll breadboard it.
Another daft question!!!
What is the purpose of the C101 cap straddling the 47k resistor in Vb?    best guess;       Extra smoothing?
I've never seen this before
And And And
what goes in the hole marked 4 8      left empty between C1 and C2 ?    guessing again; a low value cap, some sort of miller cap?
Thanks

[GGBB]

Brilliant guys thats a big help.
I'll breadboard it.
Another daft question!!!
What is the purpose of the C101 cap straddling the 47k resistor in Vb?    best guess;       Extra smoothing?
I've never seen this before
And And And
what goes in the hole marked 4 8      left empty between C1 and C2 ?    guessing again; a low value cap, some sort of miller cap?
Thanks

The 4 and 8 refer to the pins on the op-amp: +9V to pin 8 and pin 4 to ground.  That cap puzzles me too.  The other odd thing is C2 and C9 - both 100n in parallel from V+ to ground.  I would guess they are supposed to be different types - one film and one ceramic or MLCC - for EMI/RFI filtering.  I understand the ceramic, but don't know why the film was added.

[Kipper4]

Funny you should mention the EMF. I bread boarded it tonight. Without the power supply stated in the schematic. Instead I used my on breadboard supply. Designed by beavis audio as a quite supply.
I got more whining tone generator sound than I did transparent overdrive. I could hear the overdriven sound underneath it and its sounds good.haha.
The other thing I omitted on the breadboard was the output pot after the 2u2.
A couple of other lazy substitutions too
1uf in place of 2u2
10ks in place of the 12k s used to bias the 2n5457.
I will persist tomorrow night and build the power supply and make some other less lazy changes to see how it goes.

How's the BB/ king of tone build going GGGB?

[GGBB]

I hope to drill the enclosure and assemble it tonight - but I'm not in a big rush so it will largely depend on my energy level when I get home from work.  I was going to do that last night, but ended up too tired to do anything except veg out.

[fendman]

I built this circuit a few months ago, I did the etch but never boxed it.

[Kipper4]

Did it sound good?

[Gus]

With 1meg ohm input resistance I would use a fet input opamp

I would change the jfet gain stage to a more predictable silicon npn gain stage. You can select the gain you want and the bias and the transistor would not need to be selected.

The stock BB is a nice circuit.  IMO it sounds the best driving an amp that has some distortion going on.  It gives just a little more EQ and clipped  gain

[GGBB]

Enclosure drilled - assembly will have to wait - maybe Thursday.

[thelonious]

The stock BB is a nice circuit.  IMO it sounds the best driving an amp that has some distortion going on.  It gives just a little more EQ and clipped  gain

+1

It's one of my favorite first gain stages into a slightly dirty amp. I have a couple friends whose morning glory builds stay on nearly all the time. One friend plays a Vox-like amp and the other a Fender PR, which are different animals, and the bluesbreaker/morning glory sounds great with both amps.

[aion]

Just FYI, hopefully this is okay to mention here - in the next few days I'll be making all of my PCB projects available for sale, one of which is a Bluesbreaker with all the pads to add the Morning Glory's gain stage to the end to make an exact clone. It can also be configured as a single-channel King of Tone depending on how you build it. So if anyone's interested, I'll post back when the initial stock is available and ready to be ordered. In the mean time, documentation is available so you can check them all out ahead of time.

[Kipper4]

Good work thanks for sharing buddy.

[Kipper4]

I cant make it stop whining
grrrrr.
Maybe i'll just make a perf instead

[Kipper4]

I did a perf layout
Heres a link to the pdf  (file removed and updated see below)
Unverified as yet.
If you find a mistake please let me know

updated Pdf on page two of this post.