Hello,
A little background..I am very much a novice with tube amp construction. I have built a few working (guitar) amplifiers but done so explicitly working from schematics. I am not yet even a novice with design. I am currently working on a EL156 SEUL with the EZ150 rectifier, which will require some design. I found schematics from a Thai gentleman, but the power transformer he uses has a 1080VCT HT coil, which requires large resistors to bring it closer to optimal (800VCT). I do not wish to waste all this energy and create all of this heat, especially since I plan to have custom (ISO, Lundahl, Toroidal?) transformers wound for the amplifier.
I could probably figure this out without getting it into Duncan's PSU designer, but I am doing my best to learn more about design and build the best amplifier I can. Thus I would like to model the power supply. However, I can't figure it out!! This is my first time attempting to use the software, let alone adding a custom tube. I am following Duncan's youtube video on the subject, and trying to follow along with the Telefunken datasheet. Duncan advises to get the datasheet, and find the INSTANTANEOUS FORWARD VOLTAGE chart. What I am seeing on the Telefunken datasheet does not appear to match up with what's requested. I hope someone more experienced can point out if one of these charts in fact does provide the data I need, or if neither does, what can be done to model the EZ150 rectifier.
This is among my first posts..I appreciate the community here even if I haven't directly participated much. I have learned a lot browsing this forum. Thank you all!
A little background..I am very much a novice with tube amp construction. I have built a few working (guitar) amplifiers but done so explicitly working from schematics. I am not yet even a novice with design. I am currently working on a EL156 SEUL with the EZ150 rectifier, which will require some design. I found schematics from a Thai gentleman, but the power transformer he uses has a 1080VCT HT coil, which requires large resistors to bring it closer to optimal (800VCT). I do not wish to waste all this energy and create all of this heat, especially since I plan to have custom (ISO, Lundahl, Toroidal?) transformers wound for the amplifier.
I could probably figure this out without getting it into Duncan's PSU designer, but I am doing my best to learn more about design and build the best amplifier I can. Thus I would like to model the power supply. However, I can't figure it out!! This is my first time attempting to use the software, let alone adding a custom tube. I am following Duncan's youtube video on the subject, and trying to follow along with the Telefunken datasheet. Duncan advises to get the datasheet, and find the INSTANTANEOUS FORWARD VOLTAGE chart. What I am seeing on the Telefunken datasheet does not appear to match up with what's requested. I hope someone more experienced can point out if one of these charts in fact does provide the data I need, or if neither does, what can be done to model the EZ150 rectifier.
This is among my first posts..I appreciate the community here even if I haven't directly participated much. I have learned a lot browsing this forum. Thank you all!
You are easily my favorite person today. Out of curiosity, did you already have this EZ150.rect file, or did you create it from the telefunken datasheets?
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The 5V4G has quite a similar anode-cathode voltage drop versus current to the EZ150, so as a simple first-in use (or a comparison to any EZ150 model you prepare), it can be used in any PSUD2 simulation. Yes the simulation may alert you to limits being exceeded, but that won't void the simulation results.
I'm guessing you are using a proven circuit design with identified output transformer and power transformer, given your design experience is nil ? Hopefully that circuit design includes detailed design notes and modern forms of fault protection, to allow you to learn without getting burnt if something fails and takes out expensive custom parts.
I'm guessing you are using a proven circuit design with identified output transformer and power transformer, given your design experience is nil ? Hopefully that circuit design includes detailed design notes and modern forms of fault protection, to allow you to learn without getting burnt if something fails and takes out expensive custom parts.
That's good to know about the 5V4G..and good tips on circuit protection. As a high voltage maintenance/electrical construction worker, I fully appreciate overcurrent protection devices 👍..and not burning expensive components. I already have sticker shock over the bill of materials for this amp haha.
I have found something like 7 or 8 schematics on the internet for EL156 SET amplifiers; only a few that use the EZ150. I started another thread over in Tubes/valves here, hoping to get some opinions or advice from more experienced people that may have used these tubes. I really want to make this amp as well as it can be made. I'm working from Igor Popovich's Audiophile Vacuum Tube Amplifiers book series and various internet forums trying to absorb what I can.
I have found something like 7 or 8 schematics on the internet for EL156 SET amplifiers; only a few that use the EZ150. I started another thread over in Tubes/valves here, hoping to get some opinions or advice from more experienced people that may have used these tubes. I really want to make this amp as well as it can be made. I'm working from Igor Popovich's Audiophile Vacuum Tube Amplifiers book series and various internet forums trying to absorb what I can.
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Hmmm... one of the first Google hits for "EZ150 rectifier data", this, seems to have that info.
Also that sheet has graphs of "Typical" operation. Top of page 2 shows, fer example, 500VAC and 100r DCR (each side) into 16uFd makes 707VDC (of course) at no-load, 580VDC at 100mA, 400VDC at 200mA. Plot your hoped-for load condition on this graph, then think about your differences (more uFd, less R, etc).
Remember designers DID build thousands of amplifiers before PSDU, before SPICE, before pocket calculators. Slide rules were on ever`y hand but I think most audio design work was done on a cocktail napkin.
Hi,
And no, I did the EZ150 yesterday, because I already did it for silicon rectifiers... and it's simple.
Take care.