Yes, that is probably the next step. I will try and figure out something that can be squeezed onto the board. It will have to be fed by the single-ended supply though.
Funny enough, there is a little room left on the perfboard
BTW, I consider rebuilding the Pumpkin and use 2 case's instead of 1. The wooden box is not able to dissipate the heat, really. It runs a bit warm, inside. Alternatively the top and bottom plates could be filled with holes, but that wouldnt look too good.
Funny enough, there is a little room left on the perfboard
BTW, I consider rebuilding the Pumpkin and use 2 case's instead of 1. The wooden box is not able to dissipate the heat, really. It runs a bit warm, inside. Alternatively the top and bottom plates could be filled with holes, but that wouldnt look too good.
zeonrider said:
This might be the company that produce the cool looking heatsinks. Go through the catalouge and you will find some extrutions that look pretty much like those on the pic.
http://www.newtronic.dk/picture/upload/Pada_83_110.pdf
steenoe said:Yes, that is probably the next step. I will try and figure out something that can be squeezed onto the board. It will have to be fed by the single-ended supply though.
Funny enough, there is a little room left on the perfboard
.........
"buffer for Blues" or Borbely buffer ( two N Jfets in toob fashion
)steenoe said:.........
BTW, I consider rebuilding the Pumpkin and use 2 case's instead of 1. The wooden box is not able to dissipate the heat, really. It runs a bit warm, inside. Alternatively the top and bottom plates could be filled with holes, but that wouldnt look too good.
well - YOU asked for F4 capable preamp ; now suffer
I could make you one with 1/10 of dissipation , but that was outa fashion ........
hi!
You sad the truth, model 8075 on page 7 but i, cuted left and right side. It look beter.
Regards zeoN_Rider
steenoe said:
This might be the company that produce the cool looking heatsinks. Go through the catalouge and you will find some extrutions that look pretty much like those on the pic.
http://www.newtronic.dk/picture/upload/Pada_83_110.pdf
You sad the truth, model 8075 on page 7 but i, cuted left and right side. It look beter.
Regards zeoN_Rider
Steen - I just tried for you that version ( if I'm not wrong - PD's ?) of simple 1543 DAC , feeding 22K input impedance of next stage ;
there is not enough dynamics ; sound is -sorta interesting (different than SSDac with xformers , certainly ) but just with occasional glimpse of life in it ; details are almost there , but everything is somehow flat ;
you'll always know that impedance mismatch is in case , if you have wakoo response of volume control ....... turning it up almost without normal response , and then suddenly you have enough volume ;
purely subjective described ......
there is not enough dynamics ; sound is -sorta interesting (different than SSDac with xformers , certainly ) but just with occasional glimpse of life in it ; details are almost there , but everything is somehow flat ;
you'll always know that impedance mismatch is in case , if you have wakoo response of volume control ....... turning it up almost without normal response , and then suddenly you have enough volume ;
purely subjective described ......
steenoe said:
This might be the company that produce the cool looking heatsinks. Go through the catalouge and you will find some extrutions that look pretty much like those on the pic.
http://www.newtronic.dk/picture/upload/Pada_83_110.pdf
But isn't that what we have been using since forever?
Magura
jacco vermeulen said:
A pair of Pumpkin and Shunty!
The heatsink on the Pumpkin is an old cheapie NOS that I found in the cabinet. It was bought long time ago for less than US$2. I saw and adapt it for use on the Pumpkin. Now it measures the full width of the PCB and is 50mm high, 15mm deep and has a base plate of 5mm thick, fixed with stainless steel bolt and isolated from ground plane with teflon washers.
The heatsink for the pre-regulator of the Shunty is also an old cheapie NOS that I bought for less than US$1.0. It protrudes a couple of mm beyond the PCB. The CCS and the shunt Darlington transistors are installed on 2 RISC CPU heatsinks that measures 51mm x 54mm and 16mm deep that have base plates of 5mm. The 2 heatsinks are bolted together using 25mm Al flat bar. These CPU heatsinks are provided with fans but have been taken out and thrown away! They cost about US$2.50 a piece in the junkyard here.
Zen Mod said:
it's always nice to see other fellow junkdog
I just can't find anything better than these CPU heatsinks in the local market. They looked like gems to me when I spotted them. They have some 3M VHB (Very High Bond Joining System) glue on the base plate and I find the most convenient way to remove it is to rub it out with my bare thumb. Now I can't go to the US for I have lost all my finger print on my thumbs!
housing said:
I just can't find anything better than these CPU heatsinks in the local market. They looked like gems to me when I spotted them. They have some 3M VHB (Very High Bond Joining System) glue on the base plate and I find the most convenient way to remove it is to rub it out with my bare thumb. Now I can't go to the US for I have lost all my finger print on my thumbs!
next time use your Visa card for that ........
jacco vermeulen said:
No, thank you. These junk heatsinks need a lot of metal working.
jacco vermeulen said:
I have tested the pair at an ambient temperature of about 29 degree Celsius, still air. Everything goes fine and the heatsinks on the Shunty are warm to the touch only. That one on the Pumpkin is hotter but still don't burn my fingers.
Don't have thermal couple for my Fluke 189 for temperature measurement but may buy one some day. Will let you know the ¢XC/W then.