Thanks for the kind words on the guitar Jase, high praise coming from someone with your guitar collection. The Charvel sounded nuts through that amp. Best 800 tone out there. Neck was from Musikraft.
Thanks so much for this explanation and implementation video, I’ve been asking people for years how to implement DC heaters and always got the response that “DC Heaters aren’t necessary”. Thank you 🙏🏻 Thank You 🙏🏻 Thank You 🙏🏻 the mystery is now solved!
Recently i try put a dc heater in a amp with filament humming and it eliminate 90% but what really eliminate that hum was a VERY tight twisted wires and a humdinger pot plus dc elevated . Now it is dead quiet
Hi! If you want to feed all the heaters with the same power suply, you can add an 2SC5200, 2SC3280, 2N3055, etc at the output of the 7812, and you don't have to worry about the 1.5A limitation of the ci. If you need more current you can add all transistors as you wont conected in parallel. Sorry about my english, I'm from Argentina.
@@HeadfirstAmps yes, something about schematics and how is the signal flow and how much current it uses. Will be nice! I want to buy one, to install in my slo inspired amp. Thanks!
🤯🎵🎶 YALL ARE GENIUS Thank You for SHARING! I am diagnosing a blown PT, with main/ht fuses not blown. HT had 5a fuse🤬 I inherited a 2000 yr DSL JCM2000. Setting up for a band to practice, there had been No speaker plugged in, the speaker cable had been removed. flipped standby off and all power was gone, no re-light. All 4 mains coil wires have continuity together between all combinations. . Switches all work correctly. Xfmr dead, you think? No ring plugged in, no heat, no switch light, no tubes 🙏🚂🎼🌹🎶🎵🛠🔥💓 ~C< 3)>>-Z->}
I'm not super qualified, but i think because the amperage pull would be too great, i know my trainwreck PT has about 10 amps at the 6.3v heater 2ndry leads(3.15v each), i believe the Drake PT is about the same, the regulator on J's DC board shown here pull more amps than AC alone, so if you count up the tubes and their amperage you are pushing you luck with a single regulated supply, you'd probably have to add a couple more of his pcb's and a couple of those transformers he showed to handle the whole amp? I hope that helps answer your Q, probably not😂
Jason i would like to add DC heaters to my Marshall 6100LM. The amp has (6) preamp tubes (yes six!) not including the phase inverter. Can your DC heater board supply enough current for 6 preamp tubes?
It depends on the PT that is supplying the DC board…what is the current rating of it? Generally speaking, you can run 5 off a 2A 7812 regulator if is heatsinked well. Nothing here is a factor of the. DC heaters PCB, it’s about your PT supply and the ability of the regulator to supply that amount of current. I would not bother with 6.
I have a Marshall 9005 50x50 tube power amp from 1990….It’s kind of noisy..not bad,but definitely more background hum than a modern power amp….is this a mod that would work to reduce noise on it?….it has 2 EL-34’s per side,and 2 ecc83’s per side…both channels share the PT…..It’s still bone stock like it came in 1990,even the tubes are original,so replacing the caps might help too?
@@garytones434 The tubes are fine…this amp spent most of it’s life in a closet….It sounds great…it just has a higher noise floor than I am used to….I ordered all new caps,when they come in,I am replacing all of those…but I don’t think that’s the cause of the hum…
Check the bias balance between the two sides. Power tubes that not matched will give you a hum. Also check whether its at 60 or 120hz, because that will help to pin point the hum.
@@HeadfirstAmps I got it biased,everything is good there….it’s got two trim pots per side,one is for bias,the other one I think is to balance the phase inverter?….I gotta do some more digging….the schematic I found online has some different values for various things…maybe there is a revision….
@@HeadfirstAmps The schematic on first glance is irritating because there is no obvious GND connection on the output. It LOOKS separated through the 100nF cap C3. But you are naming it GND1 so your layout program connects it on the PCB. Without knowing that one could come to the illusion the current couldn't flow. I would lift the ADJ Pin up though with a Diode to get closer to 12.6V as it is important to keep it as close as possible to the specified value. Also reduces the heat on the heatsink a tiny amount. Me personally would do a 6.3DC heater to be able to use 6N2P tubes as well with a little switch. Good 12AX7 become expensive but thats another topic for itself. Thanks.
Thanks for the kind words on the guitar Jase, high praise coming from someone with your guitar collection. The Charvel sounded nuts through that amp. Best 800 tone out there. Neck was from Musikraft.
Thanks Gaz, it's a great axe mate.
Thanks so much for this explanation and implementation video, I’ve been asking people for years how to implement DC heaters and always got the response that “DC Heaters aren’t necessary”. Thank you 🙏🏻 Thank You 🙏🏻 Thank You 🙏🏻 the mystery is now solved!
Hey, my pleasure. Tnx for the feedback!
I can see why you love that guitar! So much fun.
I love the idea of DC heaters too. Going to consider the projects for myself soon.
Another great topic, I've wanted more information about this for years. As always thank you Jason👍
Awesome video Jason. Killer tone on that 800 !!!!
Yeah, it's coming along nicely this one. Been tinkering with it off and on.
🔥🔥🔥 guest guitar as well! Could that become a regular feature of the channel???
Oh, if people want to send me guitars then definitely!! :)
@@HeadfirstAmps 😎 we will have to work on that!
In your future videos, could you possibly increase the size of your mouse cursor so it's easier to see what you're pointing at?
Sure 👍
Recently i try put a dc heater in a amp with filament humming and it eliminate 90% but what really eliminate that hum was a VERY tight twisted wires and a humdinger pot plus dc elevated . Now it is dead quiet
So you canceled the dc heaters?
@@robimiara7444 yes, dc heaters sounds different to me. Can be a psicological thing... i dunno...
How about a comparison of .1uf vs .022uf PI coupling caps and other used values for coupling caps for the next vid :)
He's done it
Hi! If you want to feed all the heaters with the same power suply, you can add an 2SC5200, 2SC3280, 2N3055, etc at the output of the 7812, and you don't have to worry about the 1.5A limitation of the ci. If you need more current you can add all transistors as you wont conected in parallel. Sorry about my english, I'm from Argentina.
Interesting. Powered from where?
@@HeadfirstAmps I sent you the schematic by the contact-us form in your website
Thanks!
@@PowerxXxtremE please, send me the schematic too. 🙏
Make a video about pcb fx loop too! Thanks Jason.
I've done an install video for the fx loop, is there anything else in particular you'd like me to cover?
@@HeadfirstAmps yes, something about schematics and how is the signal flow and how much current it uses. Will be nice! I want to buy one, to install in my slo inspired amp. Thanks!
Very usefull!
So cancel pin 9, and connect one side (red) the 12vdc supply to pin 4 and the other (black) to pin 5?
Yes, that’s it
HI J, how does the regulated DC on the tubes get affected by using a variac? thanx
I have a hotrod deville and wanted to try some kt66 on it is it possible?
🤯🎵🎶 YALL ARE GENIUS Thank You for SHARING! I am diagnosing a blown PT, with main/ht fuses not blown. HT had 5a fuse🤬 I inherited a 2000 yr DSL JCM2000. Setting up for a band to practice, there had been No speaker plugged in, the speaker cable had been removed. flipped standby off and all power was gone, no re-light. All 4 mains coil wires have continuity together between all combinations. . Switches all work correctly. Xfmr dead, you think? No ring plugged in, no heat, no switch light, no tubes 🙏🚂🎼🌹🎶🎵🛠🔥💓 ~C< 3)>>-Z->}
Great! Why not all the heaters?
I'm not super qualified, but i think because the amperage pull would be too great, i know my trainwreck PT has about 10 amps at the 6.3v heater 2ndry leads(3.15v each), i believe the Drake PT is about the same, the regulator on J's DC board shown here pull more amps than AC alone, so if you count up the tubes and their amperage you are pushing you luck with a single regulated supply, you'd probably have to add a couple more of his pcb's and a couple of those transformers he showed to handle the whole amp? I hope that helps answer your Q, probably not😂
@@bonzology322 😁👍🏼 good reasoning.
Do you think this makes a considerable difference for noise in an 800 circuit? Is it elevated DC or referenced to ground?
Elevated AC or DC heaters will improve the noise floor in a 800. 12VDC is referenced to ground.
Jason i would like to add DC heaters to my Marshall 6100LM. The amp has (6) preamp tubes (yes six!) not including the phase inverter. Can your DC heater board supply enough current for 6 preamp tubes?
It depends on the PT that is supplying the DC board…what is the current rating of it? Generally speaking, you can run 5 off a 2A 7812 regulator if is heatsinked well. Nothing here is a factor of the. DC heaters PCB, it’s about your PT supply and the ability of the regulator to supply that amount of current. I would not bother with 6.
@@HeadfirstAmps thanks. ya after some thought i will run two heater boards and 2 PT for the 6 tubes,
I have a Marshall 9005 50x50 tube power amp from 1990….It’s kind of noisy..not bad,but definitely more background hum than a modern power amp….is this a mod that would work to reduce noise on it?….it has 2 EL-34’s per side,and 2 ecc83’s per side…both channels share the PT…..It’s still bone stock like it came in 1990,even the tubes are original,so replacing the caps might help too?
Scott, 30 year old valves and filter caps are probably the cause of hum. Id be doing that before bothering with DC heater in the poweramp.
@@garytones434 The tubes are fine…this amp spent most of it’s life in a closet….It sounds great…it just has a higher noise floor than I am used to….I ordered all new caps,when they come in,I am replacing all of those…but I don’t think that’s the cause of the hum…
Check the bias balance between the two sides. Power tubes that not matched will give you a hum. Also check whether its at 60 or 120hz, because that will help to pin point the hum.
@@HeadfirstAmps I got it biased,everything is good there….it’s got two trim pots per side,one is for bias,the other one I think is to balance the phase inverter?….I gotta do some more digging….the schematic I found online has some different values for various things…maybe there is a revision….
That is the worst thing to happen, a bad PT. You spend all that time making things look pretty on your layout have to rip it apart.
Totally!!
This schem dosent have a chance to work. Better to say to people that this improvement is a personal know how than cheat people.
Ok I’ll play. Cheat? Wtf are you talking about. My ‘cheat’ scheme has been used literally 100’s of times in the DIY market without a problem.
@@HeadfirstAmps The schematic on first glance is irritating because there is no obvious GND connection on the output. It LOOKS separated through the 100nF cap C3. But you are naming it GND1 so your layout program connects it on the PCB. Without knowing that one could come to the illusion the current couldn't flow. I would lift the ADJ Pin up though with a Diode to get closer to 12.6V as it is important to keep it as close as possible to the specified value. Also reduces the heat on the heatsink a tiny amount. Me personally would do a 6.3DC heater to be able to use 6N2P tubes as well with a little switch. Good 12AX7 become expensive but thats another topic for itself. Thanks.