Pumpkin preamp - More Boring Making Thread

Status
Not open for further replies.
Jump to Latest
#421
😀
 

Attachments

  • dsc01924_back_view.jpg
    dsc01924_back_view.jpg
    91.8 KB · Views: 595
#425
Hi Guys,

Now that my plitron "Over Kill trafo" has pretty much turned into "kill trafo", I need to find other sources for a transformer.

Has anybody successfully used the Apex Jr Mercury Magnetics TA110-W? Which other trafos have you guys been using?

Thanks,
Dinesh
 
#426
dviswa said:
Hi Guys,

Now that my plitron "Over Kill trafo" has pretty much turned into "kill trafo", I need to find other sources for a transformer.

Has anybody successfully used the Apex Jr Mercury Magnetics TA110-W? Which other trafos have you guys been using?

Thanks,
Dinesh
Click to expand...


why not - if you use two of them , to have twice 40Vac

you can always ask AR2 which one from Apex he use
 
#427
Apex Jr TA110-W transformer

dviswa said:
Hi Guys,

Now that my plitron "Over Kill trafo" has pretty much turned into "kill trafo", I need to find other sources for a transformer.

Has anybody successfully used the Apex Jr Mercury Magnetics TA110-W? Which other trafos have you guys been using?

Thanks,
Dinesh
Click to expand...

I am going to use the MM TA110-Ws for my Pumpkin-Shunty AC power supply. Doing a quick hookup to check voltage, two MM TA110-Ws can be hooked up to supply a nominal 40V - 0 - 40V or 48V - 0 - 48V, the latter too much probably for all but the lowest of line voltages -- Japan perhaps @ 100VAC line.

The transformers appear to be good quality E-I core and should have no problem supplying the required current to a stereo pair of preamp-regulators. In typical DIY overkill fashion, I picked up 4 of the TA110-Ws so I can go dual-mono. 😎

The price is certainly very right!

Steve Z
 
#428
Re: Apex Jr TA110-W transformer

Zen Mod said:
why not - if you use two of them , to have twice 40Vac

you can always ask AR2 which one from Apex he use [/B]
Click to expand...
Thanks, ZM. PM sent to AR2

zettelsm said:
I am going to use the MM TA110-Ws for my Pumpkin-Shunty AC power supply. Doing a quick hookup to check voltage, two MM TA110-Ws can be hooked up to supply a nominal 40V - 0 - 40V or 48V - 0 - 48V, the latter too much probably for all but the lowest of line voltages -- Japan perhaps @ 100VAC line.

The transformers appear to be good quality E-I core and should have no problem supplying the required current to a stereo pair of preamp-regulators. In typical DIY overkill fashion, I picked up 4 of the TA110-Ws so I can go dual-mono. 😎

The price is certainly very right!

Steve Z [/B]
Click to expand...

Steve,
Thanks. The price surely is right. I was planning on ignoring the 48V taps and use the 40V. Have you tried putting any load on them? Connect a 100W lamp maybe and see how they might perform. I might consider using 4 as well if I have enough space in the cabinet.

Regards,
Dinesh
 
#429
Re: Re: Apex Jr TA110-W transformer

dviswa said:

Thanks, ZM. PM sent to AR2



Steve,
Thanks. The price surely is right. I was planning on ignoring the 48V taps and use the 40V. Have you tried putting any load on them? Connect a 100W lamp maybe and see how they might perform. I might consider using 4 as well if I have enough space in the cabinet.

Regards,
Dinesh
Click to expand...

Hi Dinesh,

I have not checked out the load regulation of the trafos yet, but maybe tomorrow night a work I might have time to do so. Looking at the physical size and with my plan to use two per channel, I figured they would be well within their current capabilities and voltage droop loaded would not be a problem.

I plan on having the transformers and rectifiers in a separate box and bring only DC up to the preamp enclosure.

Steve Z
 
#430
Re: Re: Re: Apex Jr TA110-W transformer

zettelsm said:
I have not checked out the load regulation of the trafos yet, but maybe tomorrow night a work I might have time to do so.
Click to expand...
Please do.
zettelsm said:
I plan on having the transformers and rectifiers in a separate box and bring only DC up to the preamp enclosure.
Click to expand...

Wow, 2 Box design huh? Worried about interference or simply no space in the cabinet? The rectifiers are on the Shunty board, just curios, what would you gain, by building a rectifier in the other box?
 
#431
Re: Pumpkin volume control

zettelsm said:


So Mr. Steen, do I see potentiometers in place of the Twisted Pear stepped volume control and input-output boards?

Would you care to elaborate on the changes and effects on sound, if any? I would like to benefit from your experience and reasons for the changes. . .

Thanks!

Steve Z
Click to expand...

Hi Steve. I had the Elma's lying around, and since I am building the Pumpkin into this other wooden box I decided to use hem. I didnt really feel like taking the twisted setup apart😉 It took a long time to put it together, anyway. The main effect soundwise is the scratching noise with the Elma's😀. The Twisted attenuator is much better, and I will probably be using the Joshua/Darwin, with a pair of Shunty supplies and the UGS modules that will show up shortly 😉
🙂
 
#432
Re: Re: Pumpkin volume control

steenoe said:


Hi Steve. I had the Elma's lying around, and since I am building the Pumpkin into this other wooden box I decided to use hem. I didnt really feel like taking the twisted setup apart😉 It took a long time to put it together, anyway. The main effect soundwise is the scratching noise with the Elma's😀. The Twisted attenuator is much better, and I will probably be using the Joshua/Darwin, with a pair of Shunty supplies and the UGS modules that will show up shortly 😉
🙂
Click to expand...

Thank you very much for your reply -- I am relieved. I saw the slick Joshua/Darwin implementation you used and ordered enough stuff for a balanced set-up . . . imitation being the most sincere form of flattery. Well, other than money.

Pardon another question -- what are UGS modules? A URL is fine.

Thanks for your time.

Steve Z
 
#435
spavleski said:


Magura - Temperature measured on Shunty Heatsink (midle of it in between the fins) after 2 hours is 50 Degree Celsius. At the same time Pumpkin Heatsink is 53 Degree Celsius.

Too much ?


:xeye:
Click to expand...


:rofl:

crazy danske metal boy will tell ya that's too cool ........... knowing his habits of burning mosfets as popcorns in oil bucket ............

hehehe

btw - temp is exactly as prescribed 😉
 
#438
Zen Mod said:



certainly is , but also less critical than running same length od speaker cable ;

in any case - have a life with your gadgets ; it's better that you rule them than vice - versa
Click to expand...


How true! Sometimes these gadgets seems to take over our home and lives and make us more miserable when they're suppose to give us joy.

her shann
 
#439
Here is a temporaray pic of my Pumpie. The plexi-lid is really a nerve-wrecking piece of work!! Other than that, it goes as planned😉

🙂

Ballbearings in front are for extension rods. The rubber washers are for decoupling of the transformers!! Minor details, but important.
 

Attachments

  • pumpkin.jpg
    pumpkin.jpg
    86.8 KB · Views: 594
#440
As you can see on the previous pic, there are vent holes at the rear. I have made similar holes in the bottom plate (alu) But at the front! The plan is ; when the inner get hot, the convection will start going, pulling air out of the entire cabinet. Any ideas that you think could better my approach, is welcome! Here is a pic of the rearplate, it will get fairly packed....

🙂

BTW the earplugs are for when the Pumpkie starts singing:clown:
 

Attachments

  • pumpie_rear.jpg
    pumpie_rear.jpg
    62.7 KB · Views: 589
Status
Not open for further replies.
Top Bottom