Merry Christmas! Always prudent to group the grounds as you did. Ground the filters with their respective stage’s cathode grounds. Killer job on sniffing out that reverb hum.
You are so knowledgeable. I always enjoy your Informative videos. If ever I need work on my 65 Princeton (my baby) I will contact you to have it "Lyleized" & Upgraded. Happy Holidays from NYC
I watched your Marshall ground scheme video carefully over the past days and it was nice to see that theory in action in another amp in a way that was easily understood after watching the video. Great stuff as always.
Nice mod to the reverb B+. That unused power supply node suddenly makes sense. In my own PR-type builds, I just use three 22uf filter caps, eliminating the unused node. Plenty quiet that way - no audible hum. Great video, thanks!
Your amp repairs sound so good. I’m on a tone quest with my original Supros 6424. I recently restored them back to stock. I own 3, one has a tube rectifier the others have diodes. Hum has always been something I’d like to get rid of.
I can highly recommend watching Lyle's video on ground schemes. It's exemplified with various amps and then put into practice on a Marshall. It should be enough to get improvements.
Here in Oz , our wall voltage was 230 years ago , but nowadays in often high 240s . So for my Matchless collection I use a pair of 5V4 in the two socket EL84 stuff , and a 5U4 in the single socket EL34 amps . The BadCats are imported with 250V transformers , as the importer knows his product . Everything has been happy for the intervention . The Matchless are much cooler to touch .
@@PsionicAudiothat was the first song I learned on guitar and sounded so sweet. I haven't played it in decades. Now I miss my BF Princeton. This sounds awesome Lyle!
Hi Lyle, would you consider using a 5V4 rectifier for a smaller amp like this as it has a lower voltage drop than the 5U4 and also draws only 2A of filament current (like the GZ34) and also is indirectly heated for a more gradual warmup? Just wondering. 🤓👍🏽 I'm a big fan of the 5V4 these days for smaller amps.
I'm not a paying customer but I will ask you this anyway. I bought a new Jtm20h from ????? water. I love the amp. I patched the lower high channel or the lower channel 1 to the top 2 or normal channel I started getting somewhat noticeable noise like a bad ground. I will check another outlet I noticed the patch cable ( at least four feet long, had the words Marshall and pvc written on it. There might be other letters or words if I unfolded the cord. Dont' know. I never had an amplifier with a need to patch two channels before. I wondered if the materials made a difference . Ok having said that I did notice the hiss or noise wasn't as apparent when I was playing . Not maxed out on the pots. I was playing through a not well used 2x12 bass breaker cabinet (16 ohm) plugged into the 16 ohm jack on the back of the head using a speaker cable. Ok, I gave you what I had. I figure your busy but if you could, an idea or a few might be helpful. Thank you,
@@PsionicAudio A lot of people worry over rectifier heater current . There's lots of leeway , especially as the actual heater wattage is minimal anyway.
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
Amazing as always Lyle. Great to hear my little 65 again, and on my 40th birthday!
Happy birthday!
Merry Christmas! Always prudent to group the grounds as you did. Ground the filters with their respective stage’s cathode grounds. Killer job on sniffing out that reverb hum.
So nice to hear reverb at a reasonable level (as opposed to a certain West Coast retail establishment whose current demo guy cranks it.)
Lovely!
amazing sounding Amp very clean and Beautiful ,Very nice restoration Lyle and this is why your in such demand
Wow, killer sound!!
Another great repair/restoration, Thanks for posting and best wishes for a happy and peaceful Christmas.
It sounds absolutely beautiful.
You are so knowledgeable. I always enjoy your Informative videos. If ever I need work on my 65 Princeton (my baby) I will contact you to have it "Lyleized" & Upgraded. Happy Holidays from NYC
I watched your Marshall ground scheme video carefully over the past days and it was nice to see that theory in action in another amp in a way that was easily understood after watching the video. Great stuff as always.
Merry Christmas and Happy New Year to you, yours, and everyone else
Nice mod to the reverb B+. That unused power supply node suddenly makes sense. In my own PR-type builds, I just use three 22uf filter caps, eliminating the unused node. Plenty quiet that way - no audible hum. Great video, thanks!
Merry Christmas to you and yours Lyle!!!!!
Beautiful sounding amp Lyle! That’s the way it’s supposed to sound!!!!
Your amp repairs sound so good. I’m on a tone quest with my original Supros 6424. I recently restored them back to stock. I own 3, one has a tube rectifier the others have diodes. Hum has always been something I’d like to get rid of.
Thanks. Supros have awful ground schemes - they always hummed.
I can highly recommend watching Lyle's video on ground schemes. It's exemplified with various amps and then put into practice on a Marshall. It should be enough to get improvements.
Here in Oz , our wall voltage was 230 years ago , but nowadays in often high 240s . So for my Matchless collection I use a pair of 5V4 in the two socket EL84 stuff , and a 5U4 in the single socket EL34 amps . The BadCats are imported with 250V transformers , as the importer knows his product . Everything has been happy for the intervention . The Matchless are much cooler to touch .
Sounds Amazing. Beautiful job...per usual. Nice House of The Rising Sun riff.
I found myself playing it, which is odd as I never want to hear it again in my life.
But it’s in my lizard brain…
@@PsionicAudiothat was the first song I learned on guitar and sounded so sweet. I haven't played it in decades. Now I miss my BF Princeton. This sounds awesome Lyle!
@@PsionicAudio Lets hear " don't let me down "
I play that all the time.
Sounds great! Thanks for your videos, I've learned a lot. Merry Christmas!
Merry Christmas to you and your family Sir.
Happy holidays, Lyle.
Lovely sounding amp Lyle. Seasons greetings to you and your family. Have a great New Year too. 👍👍👍👍👍👍
@psionicaudio. I need to drop by and see you sometime, but don't know your schedule.
Champion
Hi Lyle, would you consider using a 5V4 rectifier for a smaller amp like this as it has a lower voltage drop than the 5U4 and also draws only 2A of filament current (like the GZ34) and also is indirectly heated for a more gradual warmup? Just wondering. 🤓👍🏽 I'm a big fan of the 5V4 these days for smaller amps.
I'm not a paying customer but I will ask you this anyway. I bought a new Jtm20h from ????? water. I love the amp. I patched the lower high channel or the lower channel 1 to the top 2 or normal channel I started getting somewhat noticeable noise like a bad ground. I will check another outlet I noticed the patch cable ( at least four feet long, had the words Marshall and pvc written on it. There might be other letters or words if I unfolded the cord. Dont' know. I never had an amplifier with a need to patch two channels before. I wondered if the materials made a difference . Ok having said that I did notice the hiss or noise wasn't as apparent when I was playing . Not maxed out on the pots. I was playing through a not well used 2x12 bass breaker cabinet (16 ohm) plugged into the 16 ohm jack on the back of the head using a speaker cable. Ok, I gave you what I had. I figure your busy but if you could, an idea or a few might be helpful. Thank you,
The filament current of the 5U4GB is 3A, thats 1A more than the GZ34
The amps sold with 5U4s had the same power transformer as the amps sold with 5AR4s. Not an issue.
@@PsionicAudio A lot of people worry over rectifier heater current . There's lots of leeway , especially as the actual heater wattage is minimal anyway.
Wow very quiet
Go Lyle Go.....go
👍👍Merry Christmas Lyle, again, another great vid
Happy holidays, Lyle.