I'm in the same boat on the adaptor boards, dBel. Also need another MOT. I only ordered one just in case the measurements didn't pan out. 😉 Oh! And we can all use some of those sweet JPS boards once Vunce is all done with his verification build. Thanks X, JPS, and Vunce, as always!
If it inspires even more confidence I measured three other crossover inductors I have laying around, ranging from 2.5mH to 20mH. All measured well within the printed spec. Really handy tool to have around. I have to leave it in sight on my shelf from now on. 😀
If it inspires even more confidence I measured three other crossover inductors I have laying around, ranging from 2.5mH to 20mH. All measured well within the printed spec. Really handy tool to have around. I have to leave it in sight on my shelf from now on. 😀
I use my DATS v2 as my go-to LCR meter also. It’s quite accurate. 75mH means a little more storage energy at the expense of higher DCR.
What do you guys estimate the number of turns in the primary? I estimate about 120 turns for 0.5ohms based on published impedance/ft of 14ga copper wire.
Vunce has most of the board built up. He also has the LU1014Ds with adapter boards already. So we should be a seeing a verification build progress pretty soon. 🙂
What do you guys estimate the number of turns in the primary? I estimate about 120 turns for 0.5ohms based on published impedance/ft of 14ga copper wire.
Vunce has most of the board built up. He also has the LU1014Ds with adapter boards already. So we should be a seeing a verification build progress pretty soon. 🙂
A bit of progress this evening, I dismantled the Stratos chassis and cleaned the heatsinks. The LuFo pcb’s are positioned such that the MosFets and JFET are just south of the HS center line.
The Mosfet in the picture is just for show, it’s not the correct part 😉
The Mosfet in the picture is just for show, it’s not the correct part 😉
Attachments
Nice work, Vunce! That looks really cool with the daughter board installed. The BOM for my OPA454 HV opamp board is here. PCBs will take a few more days.
It will be interesting to see if we can configure and ACP+ for 50Vpp output. Mark Johnson suggested using the typical Edcor transformer used for voltage gain in the M2. I think the Wayne’s Burning Amp 2018 preamp can run at +/-30v rails just fine. The resistors settings could be reduced to decrease the bias current.
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I accidently bought the wrong SMPS from Aliexpress.
It is 30v (can be sdjusted down to 28v)/10amp
Could it be used for this amp?
It is 30v (can be sdjusted down to 28v)/10amp
Could it be used for this amp?
I have used a 48v variant of this same type of supply. They have an annoying fan which can be swapped with a Noctua, problem solved. They are actually very quiet based on FFT’s that so have taken. They might suffer from startup hiccup mode if you have too much rail capacitance. I think up to 10,000uF should be ok. I used to drive my TPA3255 which had dual 4700uF and it worked fine. But when I tried driving 2x 22,000uF it did not work. But, there is a simple slow start circuit that I have that can fix that. I used it on my VFET amp.
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Yes, Vunce. 70mH, 5Adc and max 0,7 Ohm Rdc with frame. Maybe for 30 pairs the same price.
It seems that if you lower the voltage the mu lowers to,thats a good thing.
Tube Tester Files - 6S45PE
Hi Peppennino,
That’s a great price. Shipping to US will be a large cost as these are heavy. Please get a cost estimate and I think we might be able to get a GB going. 40 pairs is not an in-reachable goal.
Thanks!
X