I like the look of that - especially the Surfcaster-style f-hole.Lieutenant030 wrote: ↑Mon May 02, 2022 2:28 pm
So this is where we are at the moment. I can see this being something that gets stripped and rebuilt/reconfigured fairly regularly.
What's on your workbench right now?
- wingnutkj
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Re: What's on your workbench right now?
Kenny
- Dr Tony Balls
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Re: What's on your workbench right now?
To be fair, the "fixing" thing was a joke. This amp worked okay, the guy just wanted it to be something different. I've experienced my fair share of problems in these amps, but then again they've never been *MY* amps. Some people take care of gear better than others, and you're right they do get piles of abuse. The solder joints are ripe for cracking at the tubes, jacks, pots and it definitely happens (often) but the frequency at which problems happen is definitely dependent on user and use.hexes wrote: ↑Mon May 02, 2022 7:42 pmI just love that Tony's post was a completely gutted HRD.johnnysomersett wrote: ↑Mon May 02, 2022 11:16 am*looks over to 24yr old HRD in the corner that's never needed more than tubes and shrugs*
There was a great video sometime in the past few years about the switch to ROHS with the same design. The old HRDs were 'fine', hot bias not withstanding. Once they moved to ROHS and started saving a couple dollars per amp, the issue with the solder joints cracking around the power tubes really skyrocketed. The only HRD failures I've seen working with backline companies have been 'newer' ones. My buddy has a couple, has toured with them forever, and has had great luck, but his are definitely old.
They're just an amp that gets piles of abuse. The price was right forever for what amounted to a great amp. The old blues deluxe in the oversized cabinet is fantastic.
Instagram: thetonyballs
- Fiddy
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Re: What's on your workbench right now?
- Shadoweclipse13
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Re: What's on your workbench right now?
Had the day off today. Finally got around to shielding my Tele.
Pickup Switching Mad Scientist
http://www.offsetguitars.com/forums/viewtopic.php?f=8&t=104282&p=1438384#p1438384
http://www.offsetguitars.com/forums/viewtopic.php?f=8&t=104282&p=1438384#p1438384
- hexes
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Re: What's on your workbench right now?
starting a not so princeton princeton reverb. mid pot, 3 way neg feedback switch, 4/8/16 tap OT, lower B+ PT, NOS GE rectifier, trying a surfy industries reverb tank, 12” speaker (much to my chagrin. PRs need 10s!). Building the whole cabinet myself.
- hulakatt
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Re: What's on your workbench right now?
Part of me was hoping for you to "Boogie" it but this sounds promising as well.
She/Her
- hexes
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Re: What's on your workbench right now?
- JSett
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Re: What's on your workbench right now?
Decided tonight was the night my Bassman got a PPIMV.
As per Dr Tony Balls' recommendation
Now, I've followed it pretty much to the letter but something's gone awry. The circuit my Bassman has has the bias control off one of the grid leak resistors. I followed everything around the board (and referenced the proper layout I have) and it works. Kind of.
The master is in a weird double sweep. 0 and 10 on the knob are silent and 5 is maximum volume
Any advice?
The wire in the MV diagram from the grid leaks assumes both meet in the middle. Because one of mine instead goes up to the bias circuit I put an extra wire in to replace that connection from the pot.
This is my wiring…
I have a feeling it's that extra purple wire but I don't want to remove it and fire the amp up and risk something going pop without some advice first.
As per Dr Tony Balls' recommendation
I went with this version:Dr Tony Balls wrote: ↑Tue Mar 15, 2022 1:08 pmYES. Also i've never found a time where i've needed shielded wire for this.
Now, I've followed it pretty much to the letter but something's gone awry. The circuit my Bassman has has the bias control off one of the grid leak resistors. I followed everything around the board (and referenced the proper layout I have) and it works. Kind of.
The master is in a weird double sweep. 0 and 10 on the knob are silent and 5 is maximum volume
Any advice?
The wire in the MV diagram from the grid leaks assumes both meet in the middle. Because one of mine instead goes up to the bias circuit I put an extra wire in to replace that connection from the pot.
This is my wiring…
I have a feeling it's that extra purple wire but I don't want to remove it and fire the amp up and risk something going pop without some advice first.
Silly Rabbit, don't you know scooped mids are for kids?
- JSett
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Re: What's on your workbench right now?
After sleeping on this I went back to it.
In order to simplify things decided to put the bias circuit to AA864 specs, remove that extra purple wire and see what happened. Same thing. So I went over it all, with a fresh head, and realised that I'd literally crossed wires and had the ones from the pots to the caps swapped over
The master volume now works as intended. However, I'm getting nasty blocking distortion when at max volume. FFS. If I turn the master down just a little bit it goes right away.
In order to simplify things decided to put the bias circuit to AA864 specs, remove that extra purple wire and see what happened. Same thing. So I went over it all, with a fresh head, and realised that I'd literally crossed wires and had the ones from the pots to the caps swapped over
The master volume now works as intended. However, I'm getting nasty blocking distortion when at max volume. FFS. If I turn the master down just a little bit it goes right away.
Silly Rabbit, don't you know scooped mids are for kids?
- JSett
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Re: What's on your workbench right now?
Sorry for monologuing but it's a process and documentation is possibly helpful of others stumble across this.
Did more reading, tried to find pictures. Realised that the wires from the caps to the pot were possibly/likely meant to be moved not in addition...not overly clear from the diagram. I decided to try it. It meant making one stock lead an inch longer but also meant two less wires added to the circuit.
Checked the bias again and it was about where I have been setting it (-25mA ish) and it held steady. The MV works as it should and the blocking distortion seems to have gone. The diagram showed a 100k dual pot, which I used despite the circuit having 220k as stock. I couldn't find a 220/250k dual pot anywhere so, after checking a load of other Fender schematics which use 100k, decided it was worth a shot. I don't know if it's related but I do seem to have a little more clean headroom as a result of this or something else I have done.
Half an hour of play-through indicates I might have succeeded though.
Did more reading, tried to find pictures. Realised that the wires from the caps to the pot were possibly/likely meant to be moved not in addition...not overly clear from the diagram. I decided to try it. It meant making one stock lead an inch longer but also meant two less wires added to the circuit.
Checked the bias again and it was about where I have been setting it (-25mA ish) and it held steady. The MV works as it should and the blocking distortion seems to have gone. The diagram showed a 100k dual pot, which I used despite the circuit having 220k as stock. I couldn't find a 220/250k dual pot anywhere so, after checking a load of other Fender schematics which use 100k, decided it was worth a shot. I don't know if it's related but I do seem to have a little more clean headroom as a result of this or something else I have done.
Half an hour of play-through indicates I might have succeeded though.
Silly Rabbit, don't you know scooped mids are for kids?
- SuperAxe
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Re: What's on your workbench right now?
Honestly, try to learn how to read circuit diagrams, things will be so much easier then...johnnysomersett wrote: ↑Thu May 05, 2022 2:12 amSorry for monologuing but it's a process and documentation is possibly helpful of others stumble across this.
Did more reading, tried to find pictures. Realised that the wires from the caps to the pot were possibly/likely meant to be moved not in addition...not overly clear from the diagram. I decided to try it. It meant making one stock lead an inch longer but also meant two less wires added to the circuit.
Checked the bias again and it was about where I have been setting it (-25mA ish) and it held steady. The MV works as it should and the blocking distortion seems to have gone. The diagram showed a 100k dual pot, which I used despite the circuit having 220k as stock. I couldn't find a 220/250k dual pot anywhere so, after checking a load of other Fender schematics which use 100k, decided it was worth a shot. I don't know if it's related but I do seem to have a little more clean headroom as a result of this or something else I have done.
Half an hour of play-through indicates I might have succeeded though.
- JSett
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Re: What's on your workbench right now?
Yeah, I'm getting there slowly with diagrams over layouts but I definitely lean towards the latter for a more immediate visual aid. I actually solved this issue by cross-referencing the circuit diagram. Each time I do something like that I get a little better at reading them.
I'm so much of a visual person that I struggle doing it the 'right' way. I'm better with exploded diagrams over schematics, 3D over 2D, etc. Show me an exploded picture of a carburettor and I'll rebuild it for you no worries My day job is totally art based and my brain just naturally gravitates that direction.
Silly Rabbit, don't you know scooped mids are for kids?
- niksureal
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Re: What's on your workbench right now?
One of my Mustangs now has a Jaguar vibrato!
The plate doesnt quite cover every bit of the top two original mustang vibrato screw holes but its close enough. I am happy. It works perfectly. Just need to bend the arm so its more comfortable.
The plate doesnt quite cover every bit of the top two original mustang vibrato screw holes but its close enough. I am happy. It works perfectly. Just need to bend the arm so its more comfortable.
- Fiddy
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- CROSS_guitars
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Re: What's on your workbench right now?
Ha! awesome. That's my tremolo design. Designed for an Epiphone, Aria ET270