found a chassis in my storage place :D

[stelligan]

Congrats on a successful power up!
Damn, that build was fast....

Careful now. Them amps are gonna crowd you out yer house. Ask me how I know.

[erwin_ve]

Hi Marcus, Great it worked, I did not realise when you ordered the PT you were going for 12v.
I"ll pm you.

Erwin

[martin manning]

Fantastic!

Did you try the speaker ground at the jacks or just put it with the reservoir?

Re the relay supply, you are running it from a 6.3V winding in your PT, right? Shotkey diodes would help some, but certainly not enough to get 9V regulated, and I wonder if your 5V regulator would even function properly when that winding is loaded. A doubler configuration would fix that, but that means a new board, and reduced current capability. A 12V transformer might be the simplest way.

How’s it sound?

[norburybrook]

Fantastic!

Did you try the speaker ground at the jacks or just put it with the reservoir?

Re the relay supply, you are running it from a 6.3V winding in your PT, right? Shotkey diodes would help some, but certainly not enough to get 9V regulated, and I wonder if your 5V regulator would even function properly when that winding is loaded. A doubler configuration would fix that, but that means a new board, and reduced current capability. A 12V transformer might be the simplest way.

How’s it sound?

Erwin to the rescue he's going to do a PCB doubler board how's that for a nice bloke?

I've got 6v-0 aux secondary like i usually do and I use 5v relays but I always do a doubler as 12v rectified can give a nice or 5,6v or 9v.

Repays are switching fine with ~4v going to them at the moment anyway. the regulator is probably not doing anything.

I grounded the speaker jack with the OT ground at the reservoir. I'd already put an isolated jack in there so thought Id run the ground as far away from the loop as possible.

As i have no loop bypass, its quite a balancing act now as there;s so many places to drive or not.

Obviously my input volume is as per normal...then whats the gain structure/volume control path?

I've got a good balance with the send at 10 O'clock, the return at 2 O 'Clock and the clean master at 4 and the OD master at 7

It's certainly an aggressive amp, really rocky OD. PAB doesn't do as much on this build as on my #102, its a subtle bump that's all. The FET is great, adds a nice chime and level boost that takes the clean into spanky crunch.

I'm testing it through a 'Dumble' 1x12 Classic lead 80 at the moment. I need to pickup my Celestion 300B and put it all in the combo cab, I imagine I'll loose some low end in the smaller cab.

letting it burn in today.


M

[pompeiisneaks]

Heh, you sure it's not a Cliffe jack?

As for the voltage for the foot pedal, you could do a voltage doubler, get it up to about 9V (has to be 9 or more) and push it through a 9V regulator. You're reading about 4V but probably because you've got the relays being used so they're causing a voltage drop. I think the 5V rating means if the voltage at the input to the circuit is 5V then they will work, and cause voltage drop (I might be mistaken though, so take that with a grain of salt.)

If you've not used one before, they're pretty straight forward: https://www.electronics-tutorials.ws/bl ... rcuit.html

Go about 1/4 down the page there and they show it, just two caps and two diodes to make a doubler. It's possible, though, that the winding you're using may not have enough current? If so you may need to get another 9V transformer, yes.

~Phil

[norburybrook]

Heh, you sure it's not a Cliffe jack?

As for the voltage for the foot pedal, you could do a voltage doubler, get it up to about 9V (has to be 9 or more) and push it through a 9V regulator. You're reading about 4V but probably because you've got the relays being used so they're causing a voltage drop. I think the 5V rating means if the voltage at the input to the circuit is 5V then they will work, and cause voltage drop (I might be mistaken though, so take that with a grain of salt.)

If you've not used one before, they're pretty straight forward: https://www.electronics-tutorials.ws/bl ... rcuit.html

Go about 1/4 down the page there and they show it, just two caps and two diodes to make a doubler. It's possible, though, that the winding you're using may not have enough current? If so you may need to get another 9V transformer, yes.

~Phil

Phil,

yes, I didn't realise it wasn't a doubler as it was a PCB and different from the regular dumble ones so didn't take much notice.

Erwin is getting me a new PCB doubler board so no worries. My 6v tap is 1.5 Amp so plenty of current available the wires are as chunky as the filament supply




M

[drew]

lordy lord, that's a lot of stuff to cram in there.....

Another perspective on “cram”

[talbany]

Marus
Glad everything fired up ok
Let's do a real test With the loop jumped out with a patch cord only the master all the way up send set at noon and the return set at noon. At those noise levels could you play a show or would everyone be looking over at you?
Also at those settings is it at all buzzy or do you just hear just a little hiss in the background?
Curious as to what you found!

As far as the space thing goes? you Brits whine a lot

Music Man ODS

MM800.jpg

102 ODS

Tony's X-Model 008.jpg

Xmodel-font.jpg

"WHAT WAS I THINKING?"
Tony

[norburybrook]

LOL..you guys ....


It's funny when I see some people's regular ODS builds I always think they're using half the components I have as there's so much space but on closed inspection obviously it's the same

I think I'm generally not that tidy a person so my amps aren't either, and despite my 'trying' to build a tidy amp it never turns out that way

@Tony I shall try your experiment today and report back.

I've just found on line a NOS military Russian 2000pF mica cap for the treble I'm going to try when it arrives. I've used a orange drop in there as I had one but the originals used mica so thought a 70's NOS cap would be interesting to try for the sake of a couple of dollars.

I shall do a detailed list of what's what when I 'finish' the amp. There's a whole mixed selection of caps and resistors in there. I noticed on an old thread that got bumped recently that Brandon didn't use orange drops in his EL34 HRM ODS, I've used similar caps in my amps too on the Loop and on the bass and middle , this amp definitely sounds 'different' which is a good thing.

need to wait until next thursday before I can get my speaker in the Cab and see how that is so perhaps Erwin's board may be here by then and I can see if my 9v experiment to the footswitch works. That 'could' add grounding issues I think. I got the idea From Clifff Brown at 633 engineering here in the UK he does that with his amps.

M

[talbany]

LOL..you guys ....


It's funny when I see some people's regular ODS builds I always think they're using half the components I have as there's so much space but on closed inspection obviously it's the same

I think I'm generally not that tidy a person so my amps aren't either, and despite my 'trying' to build a tidy amp it never turns out that way

@Tony I shall try your experiment today and report back.

I've just found on line a NOS military Russian 2000pF mica cap for the treble I'm going to try when it arrives. I've used a orange drop in there as I had one but the originals used mica so thought a 70's NOS cap would be interesting to try for the sake of a couple of dollars.

I shall do a detailed list of what's what when I 'finish' the amp. There's a whole mixed selection of caps and resistors in there. I noticed on an old thread that got bumped recently that Brandon didn't use orange drops in his EL34 HRM ODS, I've used similar caps in my amps too on the Loop and on the bass and middle , this amp definitely sounds 'different' which is a good thing.

need to wait until next thursday before I can get my speaker in the Cab and see how that is so perhaps Erwin's board may be here by then and I can see if my 9v experiment to the footswitch works. That 'could' add grounding issues I think. I got the idea From Clifff Brown at 633 engineering here in the UK he does that with his amps.

M

Marcus
Sounds good looking forward to how that goes and your opinion on the commie caps
AFAIK Dumble used a mix of both 6PS and (NTE) MPP type caps in some of his HRM amps.The MPP's are a bit darker and have a tighter bass response and can be a bit more scooped in the mids. Either cap is any better than the other they are just different and depends on what direction you want to take it. Dumble obviously never used these MPP caps in his 2nd and 3rd generation amps so IMO Brandon liked the sound of them in that design and was going for a slightly different vibe. 2nd gen's are a different beast and can be a challenge. As you just found out they have a raw-ness to them that is not for everyone,(perhaps Brandon was trying to smooth the amp out some)
IMO the 2 most difficult to make sound like an original Dumble are the Low-plate Skyliners and 2nd and 3rd Gen amps. Component choice for these amps are critical to the overall sound!, more so than the HRM's or the high plates. BTW I don't see anything really wrong with your component choice. Amp should sound fine.

Personally I wouldn't worry about being too tidy. I would't exactly put HAD on the same playing field as Harry Joyce or Mark Sampson either and his amps sound just fine

Tony

[martin manning]

need to wait until next thursday before I can get my speaker in the Cab and see how that is so perhaps Erwin's board may be here by then and I can see if my 9v experiment to the footswitch works. That 'could' add grounding issues I think. I got the idea From Clifff Brown at 633 engineering here in the UK he does that with his amps.

I'm curious as to how this turns out too.

So there is precident for this system you are trying? Got any links describing the Cliff Brown system?

[norburybrook]

thanks Tony,

I realise that all great amp makers use their component choices to voice the sound their client or themselves want. while my amp is not in a cab, I'm going to experiment a little and see if I can narrow down certain aspects. I've found some NOS Sprague ceramic disk caps in the UK so I'm going to buy a couple of those and see how they sound in situ. The commie mica NOS in the treble too.

This amp is anything but smooth it's a snarly beast in fact!!! I'm debating doing a sound clip now or when it's all together and sounding like it should in it's combo.

the new Celestion 300b is the one thing I'm really keen to try as I don't think anyone at TAG has tried one yet. At 4lbs and 300w if it works well it will be a winner for ODS combos. I have to wait until next thursday to pick it up and install it.


while I think about it; Does the PAB on this have a smaller effect because it's a second gen with the corresponding 2ng gen tone stack? is this why the 2nd gen amp only has OD?

If I were to build this again I don't think I'd bother with the PAB, the FET is far more useful and sounds great. Unless there's a way of shaping the PAB better for this amp???


M

[norburybrook]

need to wait until next thursday before I can get my speaker in the Cab and see how that is so perhaps Erwin's board may be here by then and I can see if my 9v experiment to the footswitch works. That 'could' add grounding issues I think. I got the idea From Clifff Brown at 633 engineering here in the UK he does that with his amps.

I'm curious as to how this turns out too.

So there is precident for this system you are trying? Got any links describing the Cliff Brown system?

here's Cliff's web site

http://www.633amp.com/drive-king


there's nothing that mentions the 9v footswitch but my friend has 3 of his amps and it was him that told me about it.

I'll speak to Cliff and ask him how he does it.


M

[talbany]

Marcus
Did you do the standard Skyliner stack or a 2nd gen stack? Also do you have plenty of range control on T M B?
Tony

[martin manning]

Tony, I believe it’s as in the top picture in this post: https://ampgarage.com/forum/viewtopic.p ... 30#p404030