Ha that's awesome. Those 70s Ampegs Boob was talking about were monsters. Same with the early Boogies and Hiwatts. I don't think anyone makes amps like those anymore.einstein magoo wrote: ↑Tue Jul 14, 2020 1:39 pm Here's my Ampeg Reverberocket hiding behind a bunch of shit. Bought new somewhere between 1998 and 2000 I think. The years run together don't ya know. This is one of the finest amps I've ever owned. 50 really big watts, single 12, beautiful verb!
Probably not in a class with those 70's amps LT. is talking about, but I've sure got my moneys worth out of this one!
Pics are huge and fuzzy but, what the heck. Also don't know how to rotate them so...
IMG_1553.JPGIMG_1552.JPG
Lt Bob amp build - an alliance of superpowers
Re: Lt Bob amp build - an alliance of superpowers
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
Oooh yeah, that's good. You will, of course, receive no compensation, but I will use that name!
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
I have one of those ..... a great amp ..... really nice cleans ..... the distortion channel on my is glitchy but I'm sure it's just a tube.einstein magoo wrote: ↑Tue Jul 14, 2020 1:39 pm Here's my Ampeg Reverberocket hiding behind a bunch of shit. Bought new somewhere between 1998 and 2000 I think. The years run together don't ya know. This is one of the finest amps I've ever owned. 50 really big watts, single 12, beautiful verb!
Re: Lt Bob amp build - an alliance of superpowers
Back to Boob's amp.....the dreaded heater wiring going in today!!!! 
I waffled on doing it Fender style with the heater wires flying above everything, or Marshall style with the heater wiring tucked into the chassis corner only peeking out to reach a tube socket.
Either way works and has worked for decades in thousands of amps. But not much in an amp can introduce unwanted noise like AC heater wires coming in close contact with delicate signal wires, so however you do it, it needs to be right.
For Boob's amp I've decided on Marshall style because we're gonna have some extra stuff going on. Some spots will be cramped so having the heater wires out of the way will be better. My method is kind of a hybrid though. I tuck the wires into the corner of the chassis, but then they fly up and over the tube socket to connect. This allows a lot of room for the other tube socket wires to be connected from the sides without interference.
I waffled on doing it Fender style with the heater wires flying above everything, or Marshall style with the heater wiring tucked into the chassis corner only peeking out to reach a tube socket.
Either way works and has worked for decades in thousands of amps. But not much in an amp can introduce unwanted noise like AC heater wires coming in close contact with delicate signal wires, so however you do it, it needs to be right.
For Boob's amp I've decided on Marshall style because we're gonna have some extra stuff going on. Some spots will be cramped so having the heater wires out of the way will be better. My method is kind of a hybrid though. I tuck the wires into the corner of the chassis, but then they fly up and over the tube socket to connect. This allows a lot of room for the other tube socket wires to be connected from the sides without interference.
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
Greg, is there any real witchcraft in here?
https://schematicheaven.net/m-dumble.html
https://schematicheaven.net/m-dumble.html
Re: Lt Bob amp build - an alliance of superpowers
No, not in my opinion. I'm no amp guru but I can see that it's basic tube stuff. A lot of frequency bypassing and unorthodox tube biasing. The "genius" IMO comes from having the electrical theory background and tinkering time and ability to just try stuff and see what works. I bet Mr Dumble came up with his own ideas and then spent a lot of time making shit sounds before he landed on good ones.JD01 wrote: ↑Tue Jul 14, 2020 2:36 pm Greg, is there any real witchcraft in here?
https://schematicheaven.net/m-dumble.html
But do Dumbles really sound that amazing? I don't think so. They sound like nice amps. Like any nice amp. The real trick is that it's usually only great well-established players that have access to Dumbles. They can make anything sound good. Let a bedroom hack plug into one and you'll see that they aren't magic. They're just amps.
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
that's how you did yours too isn't it?Greg_L wrote: ↑Tue Jul 14, 2020 2:15 pm
For Boob's amp I've decided on Marshall style because we're gonna have some extra stuff going on. Some spots will be cramped so having the heater wires out of the way will be better. My method is kind of a hybrid though. I tuck the wires into the corner of the chassis, but then they fly up and over the tube socket to connect.
Re: Lt Bob amp build - an alliance of superpowers
Well I started the heater string last night, got about four tube sockets into it, and ripped it all out. I really didn't like the wire I was using or how it was turning out. I just couldn't let it live like that. I've used that wire before and I liked it. This time it just wasn't cooperating. 
In other news, the power transformer should be here soon and a surprise package of capacitors showed up. We've upgraded the power filter caps and all of the signal caps.
In other news, the power transformer should be here soon and a surprise package of capacitors showed up. We've upgraded the power filter caps and all of the signal caps.
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
Might be more coming too ..... I ordered the caps from 3 different places since two were back ordered and I don't remember who I ordered the 3rd set from.
maybe we can make earrings out of 'em.
maybe we can make earrings out of 'em.
Re: Lt Bob amp build - an alliance of superpowers
Ha, no problem. Earrings and cock rings!
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
Okay I braved the corona and left the house to track down suitable wire for these tube filaments. I went to the super nerd electronics warehouse...knowing full and well that it's probably the safest place to go as the only other people that go there are weirdo no-social-life neckbeards that build sex robots in their bedrooms.
So I got some wire. Heater filaments take 2 tonight.
So I got some wire. Heater filaments take 2 tonight.
Rebel Yell
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WhiskeyJack
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Re: Lt Bob amp build - an alliance of superpowers
Wait....I went to MicroCenter yesterday, and I think I saw him there. How did you see him in Houston when he was obviously in Denver?
awesome youtube comment of the day
Bill and Ted time traveled and brought a bass player from 1973, a drummer from 1984 and a guitar player from 1995. Now they're spreading peace all over the world
Bill and Ted time traveled and brought a bass player from 1973, a drummer from 1984 and a guitar player from 1995. Now they're spreading peace all over the world
Re: Lt Bob amp build - an alliance of superpowers
Ok gents....and you too [mention]Lt. Bob[/mention] 
.....the heater string is finished. This was a real pain compared to others I've done, and I really don't know why. It just was. The pins on these tube sockets seem smaller than usual. That's not a big deal when you're sticking just one wire into a pin, but these heaters are doubled and crammed together. Anyway, it came out good and I have perfect continuity from V1 all the way to the pilot light.
Preamp
Now here at the power tube sockets I used heavier wire from the pilot light to these sockets. The heater circuit goes...power transformer > pilot light > power tubes >preamp tubes. These power tubes will draw a chunk of the amperage needed for the filaments, so they get heavier wire leading up to them. After the last power tube I dropped down in wire gauge so it's easier to work with. You can see how much heavier this wire is compared to the preamp heater string. But it's all connected. The lone socket there in the corner not connected is the tube rectifier. It gets it's own supply off the power transformer.
Up in the corner is the pilot light where the heater string starts. That big ass hole in the chassis is where the power transformer will go.
And I got the pots installed and a few simple hookups done already.
Soooo....thankfully the heaters are done! On to easier/funner things. I'll install all of the transformers next.
.....the heater string is finished. This was a real pain compared to others I've done, and I really don't know why. It just was. The pins on these tube sockets seem smaller than usual. That's not a big deal when you're sticking just one wire into a pin, but these heaters are doubled and crammed together. Anyway, it came out good and I have perfect continuity from V1 all the way to the pilot light. Preamp
Now here at the power tube sockets I used heavier wire from the pilot light to these sockets. The heater circuit goes...power transformer > pilot light > power tubes >preamp tubes. These power tubes will draw a chunk of the amperage needed for the filaments, so they get heavier wire leading up to them. After the last power tube I dropped down in wire gauge so it's easier to work with. You can see how much heavier this wire is compared to the preamp heater string. But it's all connected. The lone socket there in the corner not connected is the tube rectifier. It gets it's own supply off the power transformer.
Up in the corner is the pilot light where the heater string starts. That big ass hole in the chassis is where the power transformer will go.
And I got the pots installed and a few simple hookups done already.
Soooo....thankfully the heaters are done! On to easier/funner things. I'll install all of the transformers next.
Rebel Yell
Re: Lt Bob amp build - an alliance of superpowers
Is the pilot light after the on/off switch?
Cheers
rayc
rayc