iBasso PB-2 Pelican fully balanced portable, DB-2 Dac . . HiFlight recommended op amps page 16. .
Dec 14, 2018 at 7:10 PM Post #1,546 of 1,604
Currently, the only (non-Bluetooth) headphones I've got, are:
01.) Beyerdynamic DT-831 - Headphone, 250Ω, 96dB/mW, 5Hz-32KHz, Sealed back, 1x Dynamic, Tethered cable
02.) KEF Space One (w/ANC) - Headphone, 32Ω, 89-93dB/mW, 20Hz-20KHz, Sealed back, 1x Dynamic, Removable cable

So, I'm mainly using a 2.5mm TRRS connection for the Balanced cables on my Earbuds & Earphones.
 
Dec 21, 2018 at 3:16 PM Post #1,547 of 1,604
Ended up removing the 4-Pin XLR-F from the adapter cable that came with my used amp, and soldered on a high quality Eidolic 2.5mm TRRS Jack.
Works great (but not as compact as having the 2.5mm Jack mounted in the amp) for connecting my Balanced Earbud and Earphone cables.
NOTE: While the Eidolic jack is good and secure on the 2.5mm TRRS plugs, it is not the style with a back-shell - so you have to protect and strain-relief the solder connections with heat-shrink.
.
Hirose_6-Pin_to_2-5mm_TRRS.jpg
 
Jan 7, 2019 at 1:01 PM Post #1,549 of 1,604
If you want to replace the Torx head screws that hold the PB2 case together, they're size: M2 x 10
My PB2 has the silver case, so I've identified stainless steel knurled thumbscrews, Phillips, and Allen socket screws from Amazon.
.
Knurled Thumbscrews - https://www.amazon.com/Knurled-Screws-Stainless-Steel-Pieces/dp/B01N8WLWOH
.
Phillips Screws - https://www.amazon.com/Stainless-Steel-Phillips-Round-Screws/dp/B012TD8XQI
.
Allen Socket Screws - https://www.amazon.com/uxcell-M2x10mm-Socket-Knurled-Screws/dp/B017ART2JK
 
Jan 31, 2019 at 9:22 PM Post #1,550 of 1,604
Does anyone know whether a 15V / 1.2A low noise power supply would be adequate for the PB2, in place of the stock 16V supply? Thanks!
 
Feb 1, 2019 at 3:34 AM Post #1,551 of 1,604
[QUOTE = "DBaldock9, post: 14752155, member: 451728"] Кто-нибудь знает, подойдет ли источник питания 15V / 1.2A с низким уровнем шума для PB2 вместо стандартного источника питания 16V? Спасибо! [/ QUOTE]
Yes
 
Feb 1, 2019 at 3:48 PM Post #1,553 of 1,604
Кто-нибудь знает, подойдет ли источник питания 15V / 1.2A с низким уровнем шума для PB2 вместо стандартного источника питания 16V? Спасибо!
Yes

Yes it will work. But you won't get the max voltage swing, when driving hungry Headphones. Or when you feel the need to go nuts with the volume.


Then the 15V supply should work just fine for me.
I hardly ever use headphones, and none of mine are wired for Balanced input, so they're usually connected to my iFi Micro iDSD.
The PB2 Balanced output is used to drive my various earphones and earbuds.
 
Mar 13, 2019 at 9:46 PM Post #1,554 of 1,604
Long time no see all in my old fav thread....
I have a set of used custom wood Fostex T50s in rainforest wood already wired for balanced PB2 F/S soon...they were my prototype 001 set when I was planning to get rolling with my own woodie headphone small biz before. You need to add your own earpads.
These were original photos of them when they were made---> https://postimg.cc/gallery/1vq2jdhyo/

Anyone interested, let me know by PM.
Back to all things PB2 :beerchug:
 
Last edited:
Mar 18, 2019 at 12:05 AM Post #1,556 of 1,604
Hi Lohb. It's nice to hear from you. Best wishes!

Mike
Yep,you too. Was looking at PB3....terrible I know to consider it over PB2, but easier plug for earphones. :beerchug:
 
Apr 7, 2019 at 9:27 PM Post #1,557 of 1,604
I've got several sets of LME49710HA 1-Channel Op-Amps, mounted on "2x 1-Channel TO-99 to DIP-8 2-Channel" adapters - but they're too wide to fit side-by-side, on the 2-Channel sockets in the PB2.
So, I've mounted 4x of the LME49710HA onto "1-Channel TO-99 to DIP-8 1-Channel" adapters, and they do fit on the 1-Channel sockets.
They sound good in the PB2.
.
IMG_20190407_185903-1.jpg
 
Apr 15, 2019 at 11:18 PM Post #1,558 of 1,604
Guys any decent discrete opamp discoveries in 2019 you are using with PB2 ?

I'm looking at replacing stock opamps in an ES9038Q2M Dac/amp that does about 1.5 watts per channel...bit of a wildcard portable audio unit from aliX.
 
Apr 16, 2019 at 1:31 AM Post #1,559 of 1,604
Guys any decent discrete opamp discoveries in 2019 you are using with PB2 ?

I'm looking at replacing stock opamps in an ES9038Q2M Dac/amp that does about 1.5 watts per channel...bit of a wildcard portable audio unit from aliX.

I placed several layers of Kapton tape over the gain jumpers, and on the underside of the cover, so that the Sparkos SS3602 Dual Discrete Op-Amps can be used in the PB2, with the top installed.
 
Apr 16, 2019 at 1:45 AM Post #1,560 of 1,604
OK, I owned the Sparkos and the Burson V5i with PB2 at one point, but strangely found the simple and cheaper LME49990 'better' than both even though the Sparkos did remove another layer of veil...V5i found a bit try-hard the way it presented stuff.

Had found a few discrete opamp sellers on Aliexpress but a lot of the electronics on there are half-baked.
'Hi IC' seller was one seller that had quite a few Chinese designed discrete opamps now in 2019...
among others... AliX Chi-Fi discrete opamps 2019

Edit : Decided on Hi IC's SX52B as as a low risk/price discrete opamp with some kind of positive buyer feedback.
 
Last edited:

Users who are viewing this thread

Back
Top