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A Very Compact Hybrid Amp - Page 14

post #196 of 2213

Boxed Up

Finished the box up. somehow I dont know how to use a ruler and my tube hole is off... Oh well, its all good. Now to see how hot she gets so I know if I have to add more holes or not...





post #197 of 2213
Thread Starter 
I agree on the cap upgrades. I don't think you would notice any effect from changing out any of the electrolytics or film rail caps. You might notice a difference with a different coupling cap, but also agree with cfcubed that the tube is likely to have a much larger and far more audible effect.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #198 of 2213
^Which is what make this little amp so appealing, the ease with which you can swop many different tubes. Still I think I'm gonna socket C4L/R and maybe try 2 or 3 other coupling caps. I'll wait 'till I get the pcb and see just how much room there will be to play with.
post #199 of 2213
I'm curious about what part you use to make sockets for caps and resistors. I've read about doing it but I've never been able to see what part is used and I've not been able to find something at Mouser that looks right.
post #200 of 2213
I have a few, depending on the lead size of the component. I use Mouser part numbers:
575-055210 - This is probably too small for this application.
575-054800 - again too small I think for this.
310-13-120-41-001000 - this is a Mill-Max break-apart SIP package, they can be used if you have space or you can break away the plastic housing to make them have a smaller footprint.
571-1-1571994-0 - another break-away SIP strip, this one by Tyco.
575-641503 - Yet another Mill-Max break apart SIP socket strip, this one has shorter pin sockets.
post #201 of 2213
Quote:
Originally Posted by forsakenrider View Post
Finished the box up. somehow I dont know how to use a ruler and my tube hole is off... Oh well, its all good. Now to see how hot she gets so I know if I have to add more holes or not...
Looking good. Hey I think I'm maybe 1 for 3 of tube holes coming out just the way I want them... What saves my butt are tube protectors (also available on ebay once in a while). Even if the hole is not centered you should be able to make it look centered using one of those rings. You can see I used it to "center" my hole in this shot of the underside:



The ones for our tubes comes with three rings & the inter-ring spacers. I just use one ring on each build so I can roll tubes.

Now you don't have to tell us if that cool ring pattern on the sides was artistic expression OR began as laziness (not changing out the hole saw). It can be a mystery. I'll go with artistic expression. And you got nice floor confetti to boot...
post #202 of 2213
So, cfcubed and Forsakenrider, any tube preferences so far? Or how about bang for the buck finds?

Anyone have any opinion on Tungsol or JJ Tesla tubes?

Also, is there room for a 1/4" jack?
post #203 of 2213
Quote:
Originally Posted by cfcubed View Post
....Now you don't have to tell us if that cool ring pattern on the sides was artistic expression OR began as laziness (not changing out the hole saw). It can be a mystery. I'll go with artistic expression. And you got nice floor confetti to boot...

Well I actually drilled the side holes first, what a PITA! the damn rails on the inside pull the drill once you get through the outside layer! then when I was drilling the tube hole with the hole saw I saw the cool ring and figured it might take away the obviousness of a couple crooked holes. I think it worked pretty good for that! ha. I have a few secret plans for the case coming up this month once I get a few things I need.


As for tubes, as Ive said before 6dj8 amperex bugle boy. With this tube all notes are full of punch with ZERO harshness. Its simply beautiful! I swear this amp sounds better every time I listen. really sparkles the female vocals and bass is amazingly rich.
post #204 of 2213

Sounds like another build tip to me...

Quote:
Originally Posted by forsakenrider View Post
Well I actually drilled the side holes first, what a PITA! the damn rails on the inside pull the drill once you get through the outside layer! <snip>
I guess I got lucky with the staggered pattern I used... My holes happened to line up pretty well w/inside PCB slot voids:



Obvious but we need side holes because the PCB is the full width/length of case (bottom holes wouldn't cut it). BTW I drilled the hole pattern in my top & vinyl dyed the case ends so I should have new pics of my done amp soon.

WRT to tubes - Will need to spend more time w/them to have more impressions. I do have 3 or 4 tubes on the way to try out
post #205 of 2213
Wondering what you guys are using for part # :
C1E
581-BF074D0105J
Boxed Metal Film Capacitors 63V 1.0uf 5%

the min quantity for Mouser is 100 and its recommended replacement is out.
Would this be good replacement from Digikey?
495-1119-ND
post #206 of 2213
Thread Starter 
I believe this one will fit:

505-MKS21.0/63/5

And I thought I had changed the BoM to use this part number. My fault.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #207 of 2213
Runeight, I just sent you an email about the BOM..


Shesh.. while I was composing the message, you answered the C1E question I asked..

there is a 581-BF074D0105JDD but they are going to stop stocking it after the current stock runs out.. (897pcs now)

JD
post #208 of 2213
phew done with mouser, now I just need to find a place to get the adapter and tube socket and maybe some nice hookup wire.
post #209 of 2213
post #210 of 2213
Thanks Slim, im been trying to find a place with all three items. Shipping is pretty good too.
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