B1 with Korg Triode

[Nelson Pass]

50 C is nothing to worry about.

80 C in a resistor whose value is nominal
is also nothing to worry about.

 

[mnkosch]

Hi all,

Got my preamp fired up this past weekend. Once I finish polishing up the enclosure it'll be good to go. Tubes glow a nice blue and have T7 and T8 stable at about 12.1V for the time being.

A couple quick questions:
1.) T3 measure 22.45 or so volts, right outside of the "within .5V" of 23V. Is this something worth trying to fix? (If I recall, one of the power resistors was slightly off, but I only ordered one of each)
2.) The trimmer pots are in pretty different positions to achieve the same voltage. Is that normal?

Thanks in advance for any help.

 

[dezibaby]

Danke Papa.

A. Not relevant.

B. Totally OK.

 

[Zen Mod]

Hi all,

Got my preamp fired up this past weekend. Once I finish polishing up the enclosure it'll be good to go. Tubes glow a nice blue and have T7 and T8 stable at about 12.1V for the time being.

A couple quick questions:
1.) T3 measure 22.45 or so volts, right outside of the "within .5V" of 23V. Is this something worth trying to fix? (If I recall, one of the power resistors was slightly off, but I only ordered one of each)
2.) The trimmer pots are in pretty different positions to achieve the same voltage. Is that normal?

Thanks in advance for any help.

1.just chill
2.just chill

 

[ClaudeG]

No prob at all, Mnkosch

Claude

 

[mnkosch]

Cool, thanks all! Looking forward to listening to it soon!

 

[tdr1213]

Stuffed the board with the power supply parts and tested per instructions...I get 24.1 volts, but when I test the 9.1v diode it is 0. I guess I need to source a new one. Do you know the specific part number and best source to purchase?

 

[tdr1213]

I found the parts list.

 

[6L6]

Just to check, is the diode installed the right way? If backwards it will read zero...

 

[tdr1213]

Yes, it’s installed correctly. Any other checks? I took a pic, but don’t know how to attach yet.

 

[tdr1213]

Pic of the diode.

 

[soi]

You can desolder the diode and check whether it is shorted out or not. Be careful, do not power up your unit without the diode if you have the nutube already soldered on. The diode protects your heater from overcurrent. Without it you risk burning the filament. If the diode is okay then check your electrolytic caps to see if one of them has shorted out.

 

[tdr1213]

Ok. Thx. After I desolder do I simply test continuity to see if it’s good?

 

[soi]

It’s a diode, so it’ll show continuity in one direction but open in the other (as long as the voltage is below 9V). If you see continuity in both directions then it means it’s no good.

 

[ghitus]

Hi guys, this my personal interpretation of the B1 with Korg Nutube. This is the best I was able to do. I know that many builds I saw on this thread are really better than mine, but, hey, this is B1 Nutube and it sounds great!!!

Gaetano.

 

[ClaudeG]

That looks great to me

Claude

 

[SuppersReady]

Naim SNAPS

I feel sure that it should be fine, but is there any reason that I couldn't use a Naim SNAPS PSU to power the B1 Korg? I haven't received my kit yet so I don't know the current rating of the provided wall wart.

The back of the SNAPS indicates the output is +24V @ 300mA. The regulators inside are run of the mill LM317T which are rated for 1.5A.

Any thoughts?

 

[dewdrop]

It should work

 

[ClaudeG]

300mA are rather on the thin side... sure it is not more?


Claude

 

[ghitus]

That looks great to me

Claude

Many thanks, Claude ;-)