With so much replaced, this kinda makes me believe even more so that searching for 'mojo' in Vintage Marshalls is a needlessly costly exercise. If you want that sound, it looks like it starts with a really good OT replica, and the rest you can build around it, with modern, and widely available, components. I hope one day to build a 12-Series EVH Spec '68 Superlead, from all new parts.
I remember when I was a kid, 9 or 10. Going to the rxall drug store with my older brother checking tubes. He said this one’s expensive 3 bucks. I suppose back then that was a lot for a tube, I want to say RCA but that was long ago.
The only problem with those testers is they were really meant for testing tubes used in TV sets and radios, so they often times only tested a tube to about 150 volts or so. That was ok for 12AX7, etc. but useless for EL34's etc.
I too back in about 1970 owned a 65 Bassman and I remember buying pre tubes and testing tubes at the Rx store. I bought new RCA 6L6's at the music store. Small town Iowa, the only Fender guitars in stock were Mustangs and that Fender hollow body, and Harmony Rocket.
@@oldguy5381 Hey, I was from Keokuk, I went to machinists school in Burlington. I bought a Gibson at Muntz's Music about 71, and i worked in Burlington from 2012 till 2017 at Dresser Rand, which was the old Murray Turbo.I've had some adventures and some misadventures in Burlington. We probably know some of the same people. Were you around when Brillo and the Firebirds were playing around from Macome?
Please tell me you're going to follow Ken Fischer's "Measured Current Biasing" method on this amp. Find the sweet spot on the bias pot, between 10-40mA per tube... wherever the amp sounds best between those settings is the "correct" bias for that particular Marshall. Some guys like it running hot, some people like myself like a little cooler bias with more headroom. Ken would always adjust the bias based on the players speakers and style of playing. Most techs just set it to a specific voltage or current and call it a day, but you can really bring out the amps natural best tone by tinkering with the bias. Great job, can't wait to hear this cranked up! Regards 🎸
@@PsionicAudio Ken was the Leonardo Davinci, Albert Einstein, and Nicola Tesla of guitar amplifiers. It's just a shame he never got the mainstream recognition he deserved... but at the same time it's nice that his legacy is known by only us amp nerds who appreciate the impact he had. I sure miss him.
Maybe find a washer with the 3/8 hole and will just fit into the hole to take up the thickness of the faceplate and chassis to fill that gap and get it closer to flush of the faceplate. You get lucky sometimes.
Could you put it on an oscilloscope when you bias the amp up with the tubes in it? I'd like to see where the bias is in mA (or DC mV) when the sine wave isn't crossing over or clipping.
I have a brand new-ish 1959HR that is ghosting really bad. I had the power tubes replaced other than that it’s all stock. It had been in repairs in and out but the ghosting is not going away. Any idea of what could that be?
That's usually filter caps and/or grounding, but I've seen a lot of new RI Marshalls with defective transformers. Beyond that I cannot speculate. A good tech will find it.
@@PsionicAudio thank you so much for sharing your thoughts on this matter. I hope the amp tech can figure this out. I suggested to them that it might have been worth checking the filter caps under the oscilloscope but they said that an eye inspection should be enough to tell whether they’re in working condition or not. It’s funny that you mentioned the bad grounding issue because it had a loud 60(?) Hz noise the second time I brought it back to the technician. It might have been 120Hz but I won’t know that for sure because that is less audible now. A bad transformer may be something they may want to check. Thanks again!
@@PsionicAudio I completely agree with you. If they were to check the filter caps objectively worst-case scenario we'll know for sure that's not the issue. I hope they can find out what the issue is. Thanks for sharing your thoughts on this matter, it makes me feel like I'm not crazy for not 100% agreeing with the amp tech guys. I wish was closer to your location so that you could take a look at it.
Not critical, just a question. Merlin recommends that the heater connections pass over the socket on the 12ax7 instead of either side since the electrical field generated is much smaller. I noticed that you didn't do that and just wondered why? Beautiful work.. Loving your videos.
I usually do that in my own builds but it would have been a lot of extra work to rewire this Marshall that way. Instead I carefully dressed all the grid connections away from the black heater wire side. You can see that here. Same result.
You've turned that mess into a thing of beauty!
Impressed does not express what I’m really thinking. You are a old school craftsman. It is a pleasure to watch you work, Sir.
Beautiful work
What a change. Looks great.
Looking super nice.
Cheerz!
Looks great lyle, as neat if not better than any I've seen, and with the new ground scheme will sound better than it ever has👍
Wow, what a different thas is. Nice.
Wow looks incredible. I wish this was my amp😍
Looking great.
Amen! What a clean build all is right in the Marshall world.
Looking great, and on it's way..Good job..Ed..uk...😀
With so much replaced, this kinda makes me believe even more so that searching for 'mojo' in Vintage Marshalls is a needlessly costly exercise. If you want that sound, it looks like it starts with a really good OT replica, and the rest you can build around it, with modern, and widely available, components. I hope one day to build a 12-Series EVH Spec '68 Superlead, from all new parts.
I remember when I was a kid, 9 or 10. Going to the rxall drug store with my older brother checking tubes. He said this one’s expensive 3 bucks. I suppose back then that was a lot for a tube, I want to say RCA but that was long ago.
The only problem with those testers is they were really meant for testing tubes used in TV sets and radios, so they often times only tested a tube to about 150 volts or so. That was ok for 12AX7, etc. but useless for EL34's etc.
I too back in about 1970 owned a 65 Bassman and I remember buying pre tubes and testing tubes at the Rx store. I bought new RCA 6L6's at the music store. Small town Iowa, the only Fender guitars in stock were Mustangs and that Fender hollow body, and Harmony Rocket.
Burlington, Iowa was where I was raised how about that
@@oldguy5381 Hey, I was from Keokuk, I went to machinists school in Burlington. I bought a Gibson at Muntz's Music about 71, and i worked in Burlington from 2012 till 2017 at Dresser Rand, which was the old Murray Turbo.I've had some adventures and some misadventures in Burlington. We probably know some of the same people. Were you around when Brillo and the Firebirds were playing around from Macome?
Wow small world. Yea I left in the mid 70s came down south. I believe they leveled the Murray ironworks building. I guess nothing stays the same.
Very pretty. That 'flashback' to the old, mangled PCB: trauma! I'm gonna need counselling after that.
Looks ready to rock
She’s looking real good there, Snowpants.
Love your content! Please invest in some more lighting. Hard to see with all the shadows.
Please tell me you're going to follow Ken Fischer's "Measured Current Biasing" method on this amp. Find the sweet spot on the bias pot, between 10-40mA per tube... wherever the amp sounds best between those settings is the "correct" bias for that particular Marshall. Some guys like it running hot, some people like myself like a little cooler bias with more headroom. Ken would always adjust the bias based on the players speakers and style of playing. Most techs just set it to a specific voltage or current and call it a day, but you can really bring out the amps natural best tone by tinkering with the bias. Great job, can't wait to hear this cranked up!
Regards 🎸
Sounds like my approach. I didn't know I was copying Ken...
...I'll live with it. ;)
@@PsionicAudio Ken was the Leonardo Davinci, Albert Einstein, and Nicola Tesla of guitar amplifiers. It's just a shame he never got the mainstream recognition he deserved... but at the same time it's nice that his legacy is known by only us amp nerds who appreciate the impact he had. I sure miss him.
Maybe find a washer with the 3/8 hole and will just fit into the hole to take up the thickness of the faceplate and chassis to fill that gap and get it closer to flush of the faceplate. You get lucky sometimes.
Could you put it on an oscilloscope when you bias the amp up with the tubes in it? I'd like to see where the bias is in mA (or DC mV) when the sine wave isn't crossing over or clipping.
I could, but I don't use the crossover method.
See:
www.aikenamps.com/the-last-word-on-biasing
Are you familiar with The Ship Of Theseus?
Very much so. Referenced it in a video a while back.
I have a brand new-ish 1959HR that is ghosting really bad. I had the power tubes replaced other than that it’s all stock. It had been in repairs in and out but the ghosting is not going away. Any idea of what could that be?
That's usually filter caps and/or grounding, but I've seen a lot of new RI Marshalls with defective transformers.
Beyond that I cannot speculate. A good tech will find it.
@@PsionicAudio thank you so much for sharing your thoughts on this matter. I hope the amp tech can figure this out. I suggested to them that it might have been worth checking the filter caps under the oscilloscope but they said that an eye inspection should be enough to tell whether they’re in working condition or not. It’s funny that you mentioned the bad grounding issue because it had a loud 60(?) Hz noise the second time I brought it back to the technician. It might have been 120Hz but I won’t know that for sure because that is less audible now. A bad transformer may be something they may want to check.
Thanks again!
A visual examination is enough?
Hogwash.
Plenty of bad filter caps look fine. You need to find a real tech.
@@PsionicAudio I completely agree with you. If they were to check the filter caps objectively worst-case scenario we'll know for sure that's not the issue. I hope they can find out what the issue is. Thanks for sharing your thoughts on this matter, it makes me feel like I'm not crazy for not 100% agreeing with the amp tech guys. I wish was closer to your location so that you could take a look at it.
Not critical, just a question. Merlin recommends that the heater connections pass over the socket on the 12ax7 instead of either side since the electrical field generated is much smaller. I noticed that you didn't do that and just wondered why? Beautiful work.. Loving your videos.
I usually do that in my own builds but it would have been a lot of extra work to rewire this Marshall that way. Instead I carefully dressed all the grid connections away from the black heater wire side. You can see that here. Same result.