So far the updated spec-sheet only shows enhanced rail voltages beyond ±71VDC for the EF3-5. Is there any chance this will do for an EF3-4 V5 if components are selected correctly?
Best regards
Best regards
Cudos to all involved what a fantastic product I can't wait to build a fully symmetrical version. I may need Perspex lids to show it all off.
Thanks again to all involved these take so much energy and time
Well done
Steve
Thanks again to all involved these take so much energy and time
Well done
Steve
Trying to read up on the Wolverine project. Hope I'm not too late to get in on the group buy.
What would be the ideal transformer voltage to power a single EF3-5 Wolverine?
Is there a schematic for the power supply?
Is there a schematic for the power supply?
Please take a look at the first post of the build thread.
The build guide will contain alot more guidance on power supply layout including schematics
Looking at the data sheets, the MJL21193/4 appears to have double the 100v SOA of the MJL4281/4302 pair.
They are slower however and not as linear with increasing current drain.
Overall a more durable output stage though?
You are right, but I was referring to just the wolverine. MJL21193/4 is not suitable at 4mhz, all wolverine outputs ~30mhz
One thing to note is the Thermal Resistance, Junction−to−Case is significantly worse for MJL21193/4 @ 0.7°C/W as compared to 0.54°C/W for the MJL4281/4302.
Also the absolute power handling of the MJL21193/4 is 30W less than the MJL4281/4302.
I would recommend to use the MJL4281/4302.
-Dan
The capacitors on the input are high quality polypropylene.
Friends, I'm getting out of this GB. Finally I decided for another amplifier from @astx, on the input 170gr on the output exicons lateral mosfets. I think this combination will suit me better in conjunction with the split preamplifier DCG3 + UltraBiB.
But anyway I wish the rest of you a lot of fun when building the Wolverine amplifier. 😍
But anyway I wish the rest of you a lot of fun when building the Wolverine amplifier. 😍
Hi guys,
I am wondering, will 4U Dissipante be sufficient for EF3-5 @ 64V (maybe 71V, undecided yet) build, or 5U chassis is mandatory in this case? The reason is a bit cheesy: my current amp is 4U, and fits perfectly into my listening setup.
Or maybe a concern that I am just a beginner should actually outweigh all other and pull me down to the EF3-4 version? (which, as far as I got it right, will be totally ok to mount into the 4U chassis).
Any advice will be much appreciated!
Also, is there any deadline for this GB? I just started to put everything together "on paper" yesterday, so have to spend some time planning before placing my order.
I am wondering, will 4U Dissipante be sufficient for EF3-5 @ 64V (maybe 71V, undecided yet) build, or 5U chassis is mandatory in this case? The reason is a bit cheesy: my current amp is 4U, and fits perfectly into my listening setup.
Or maybe a concern that I am just a beginner should actually outweigh all other and pull me down to the EF3-4 version? (which, as far as I got it right, will be totally ok to mount into the 4U chassis).
Any advice will be much appreciated!
Also, is there any deadline for this GB? I just started to put everything together "on paper" yesterday, so have to spend some time planning before placing my order.
Thining about getting in on this, but have some questions regarding what needs to be selected in the order spreadsheet. Target would be an EF3-4 64V.
Heatsink Kit (Enough Heatsinks for 2 boards) EF3-4 (IPS, Pre-Driver & Driver): $27.50 USD (6 Heatsinks Total) 1
Transistors (Q105 KSC3503E, Q106 KSA1381E, Q13 KSC3503E, Q11 KSA1381E, 4 Pairs per stereo Amp.) 8
Speaker Protection Board 1 (or 1 per channel?)
Main EF3-4 amp boards (L & R) 2
IPS boards 2 (I assume I need these?)
Not sure what I will do for PSU. I see the dual bridge boards (2 per amp for dual mono), and the Ground lift and T ground boards (will need to research those).
Anything I've missed? Also not sure on those transistors (what choices are there, advantages/disadvantage, etc).
Heatsink Kit (Enough Heatsinks for 2 boards) EF3-4 (IPS, Pre-Driver & Driver): $27.50 USD (6 Heatsinks Total) 1
Transistors (Q105 KSC3503E, Q106 KSA1381E, Q13 KSC3503E, Q11 KSA1381E, 4 Pairs per stereo Amp.) 8
Speaker Protection Board 1 (or 1 per channel?)
Main EF3-4 amp boards (L & R) 2
IPS boards 2 (I assume I need these?)
Not sure what I will do for PSU. I see the dual bridge boards (2 per amp for dual mono), and the Ground lift and T ground boards (will need to research those).
Anything I've missed? Also not sure on those transistors (what choices are there, advantages/disadvantage, etc).
See the FAQ and PSU papers attached to the first post of the build thread, all PSU info answered there.
The heatsink kit is dependent on how you envision mounting the boards to the main heatsinks - parallel with the main heatsink (recommended - IPS and predriver only) or perpendicular to (IPS, predriver and driver). The auxiliary heatsink kits have a separate column to select accordingly, you may have to open the column width or height to see as excel scaling differs from one computer to the next.
Speaker protection is one per channel so order 2 for stereo.
EF3-X is the name of the output stage and the IPS is the input stage, you need both if you're starting fresh.
The heatsink kit is dependent on how you envision mounting the boards to the main heatsinks - parallel with the main heatsink (recommended - IPS and predriver only) or perpendicular to (IPS, predriver and driver). The auxiliary heatsink kits have a separate column to select accordingly, you may have to open the column width or height to see as excel scaling differs from one computer to the next.
Speaker protection is one per channel so order 2 for stereo.
EF3-X is the name of the output stage and the IPS is the input stage, you need both if you're starting fresh.
Hi everyone, is the group buy still open? As a tube guy, I would love to build a reference quality sis amp.
Hi Guys,
Big news for the Wolverine 5th Group Buy!
The Wolverine IPS V5, Precision EF3-3 V5, EF3-4 V5, and EF3-5 V5 (Left & Right) boards along with all the Auxiliary boards are now in production! We’ve placed the bulk order, and the boards, complete with their stunning gold ENIG finish, should hopefully ship from the manufacturer in approximately 2 weeks.Once they arrive, I’ll organize packing and shipping to get them to you as quickly as possible.
I’ll reach out to everyone to finalize payment and shipping details via a paypal payment request.
If you haven’t joined yet, there’s still a small window to get in—check out the first post in the Wolverine 5th Group Buy thread for details and email your order sheet to stuartmp@internode.on.net with the subject “Wolverine Project – Your DiyAudio Username.”
A massive thank you to @danieljw, @Mainframe, and the entire Wolverine Team for their incredible work in getting us to this point.
Your patience and support make this project shine! Stay tuned for more updates in the Wolverine Build Thread and Development Thread as we near the finish line.
Best regards,
Stuart (stuartmp)
Wolverine Team
Big news for the Wolverine 5th Group Buy!
The Wolverine IPS V5, Precision EF3-3 V5, EF3-4 V5, and EF3-5 V5 (Left & Right) boards along with all the Auxiliary boards are now in production! We’ve placed the bulk order, and the boards, complete with their stunning gold ENIG finish, should hopefully ship from the manufacturer in approximately 2 weeks.Once they arrive, I’ll organize packing and shipping to get them to you as quickly as possible.
I’ll reach out to everyone to finalize payment and shipping details via a paypal payment request.
If you haven’t joined yet, there’s still a small window to get in—check out the first post in the Wolverine 5th Group Buy thread for details and email your order sheet to stuartmp@internode.on.net with the subject “Wolverine Project – Your DiyAudio Username.”
A massive thank you to @danieljw, @Mainframe, and the entire Wolverine Team for their incredible work in getting us to this point.
Your patience and support make this project shine! Stay tuned for more updates in the Wolverine Build Thread and Development Thread as we near the finish line.
Best regards,
Stuart (stuartmp)
Wolverine Team
Hi Guys,
Since some people are gearing up to build a V5 Wolverine I wanted to share some information which might be beneficial as you gather parts to build your amplifier.
During some testing which pushed the thermal limits a lot harder than usual, I had a batch of silicon insulator pads which were not very good and I lost a couple of output devices so I asked around and did a few searches of what might be a better option for the insulator pads on the ouput devices.
Initially I moved to Kapton (0.06mm) and ordinary (Unick) white thermal grease with an aluminium spreader bar.
This made a big improvement.
However through some discussions I found out Alumina (Aluminium Oxide) pads are much more thermally conductive Kapton tape despite being 0.6mm or 1mm thick Alumina is a far superior thermal conductor compared to Silicon or Kapton.
Over time, I have tried mica, silicon sheet, silicon pads, adhesive silicon pads of varying types, Kapton and Alumina.
More recently I have tried Aluminium Nitride and I would say it is definitely worth checking out.
Aluminium Nitride has considerably higher for thermal conductivity than Alumina.
I have in the last few days changed over my EF3-5 test build to Aluminium Nitride insulator pads and Maxtor CTG8 thermal paste. I also use controlled torque for the fasteners. So far so good
Hope this is useful info
- Dan
Since some people are gearing up to build a V5 Wolverine I wanted to share some information which might be beneficial as you gather parts to build your amplifier.
During some testing which pushed the thermal limits a lot harder than usual, I had a batch of silicon insulator pads which were not very good and I lost a couple of output devices so I asked around and did a few searches of what might be a better option for the insulator pads on the ouput devices.
Initially I moved to Kapton (0.06mm) and ordinary (Unick) white thermal grease with an aluminium spreader bar.
This made a big improvement.
However through some discussions I found out Alumina (Aluminium Oxide) pads are much more thermally conductive Kapton tape despite being 0.6mm or 1mm thick Alumina is a far superior thermal conductor compared to Silicon or Kapton.
Over time, I have tried mica, silicon sheet, silicon pads, adhesive silicon pads of varying types, Kapton and Alumina.
More recently I have tried Aluminium Nitride and I would say it is definitely worth checking out.
Aluminium Nitride has considerably higher for thermal conductivity than Alumina.
I have in the last few days changed over my EF3-5 test build to Aluminium Nitride insulator pads and Maxtor CTG8 thermal paste. I also use controlled torque for the fasteners. So far so good
Hope this is useful info
- Dan