truepath my new baby

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#23
Hi the sound improve a lot during this month 😀

I upgrade my dac with new peja 1541 dac now the amp kick very strong bass that are incredible with my small ss15w and the ss9800 are soo sweet 😉

I start to think to put on input the duelund caps or full mundurf s/o....
 
#25
#26
No, haven't hooked it up yet. If it sounds as good as my heavily modified Sonic Impact amp then I'll be perfectly happy. I suspect it may sound even better though.
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Hey DeciBel,

Did you ever mod the Stock DCP-501 you bought off me? I still have a modded DCP-501 in the closet. Does the TA3020 of the DCP-501 compare well against the TA3020 truepath?

I have reached my nirvana with my Krell Clone, so I have not messed with the DCP for months.
 
#27
My DCP-501 is near completion. However I don't have a Truepath to compare to so I can't answer that question for you, but I'd assume the Truepath is a better amp if not just for the great PCB layout. The Motorola TA3020 implementation is more of a datasheet application with no bells and whistles.

Work is real busy lately but I plan to have My DCP501 playing some music in the next week or two. I know it's been a looong time but it's sitting on the assembly bench as I type this. Here's a list of what I've done to the DCP-501:

-gutted the amp board, and power supply
-installed amp and PSU in a 2U rack chassis
-increased power supply capacitance
-cut tracks at the output of the relays, and wired the speaker terminals directly to the relays.
-replaced input coupling caps with nice polypropylene ones
-speaker grounds wired directly to the power supply star ground
-applied a small modification to the power supply board. I noticed the star ground was connected to the XF centre tap by a couple of small jumper wires, so I replaced these with a thick 16 guage wire.

I thinks that's it.
 
#28
Hey,

I took the 5 2.2uF electrolytic input coupling caps completely off. I know my pre was good for it. No cap always sounds better than the best poly cap as far as I am concerned.

You might run into issues on the power and signal grounding - as you probably know, the amp board won't come out of standby unless the grounding (PS to amp board) is connected.

All in all it sounded good. Still preferred my UCD over it, but it was cheap, powerful and 5 total channels to boot. I still could putz around with the power supply and amp board to make improvements, but I just need some time...

Keep me posted on your results...maybe someday I will be able to set aside some time to get back to mine...
 
#29
john65b said:
You might run into issues on the power and signal grounding - as you probably know, the amp board won't come out of standby unless the grounding (PS to amp board) is connected.
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No worries, the amp will still be properly grounded, just a bit better having the speaker return path go to the PSU star ground rather than to the amp board ground plain. I'm more worried about having to install a shield in between the transformer and the amp board, as they are a rather snug fit into the chassis.

I must leave the coupling caps in place, as in my system the input caps on the amplifier are the only AC coupling in the entire system.

I may post some photos of the work once it's completed, though this amp was really built just for fun, and is not a representation of my best work. My reference of comparison sound quality wise will be my Mauro Penasa "My_Ref" rev. C amp which IMO is a very good amp.
 
#34
Well it's a bit like Giovanni said, it doesn't make much sense to quarrel about frequency response linearity in a range up to 90Khz. The differences up to 15K-20K are just 2db, so it takes some extremely good ears to distinguish the differences....
 
#40
dede said:



Interesting 🙂 what's your favourite ?
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Lundahl LL1592 is really great, but although some give bad raps about them I love the OEP A262 series transformers. The Neutrik are great because they are very small and very affordable AND still formidable quality... I have tested most of them on a Neutrik A1 audio analizer and most manufacturers are quite honest in their spec sheets (like freq. response..)

In general Lundahl makes the best transformers....
 
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