B1 with Korg Triode

[Zen Mod]

you must be a

I already forgot what I posted yesterday

 

[Tomcat1969]

Gentlemen. As I was taking the pictures I spotted the mistakes. Yes, there multiple mistakes.

I mixed up the wiring of the Alps.

If there were a prize, Ixnay would have won it.

To late for me now so I'll redo the pot wiring
And report back tomorrow.

Many thanks guys.

 

[Brijac]

First B1K smd is great success as Borat would say 😁 Voltages are good, nutube lights up well, power on led is blinding to my camera and eyes, will deal with that tomorrow. This batch of jfe2140 gives 5mA with 100R (had these on hand) sR each (good little buggers). Should be good enough, might order resistors to bump it up to 6-7mA but don't think it will matter tbh. I'll pop more pictures during the day, or when i box it up during the week, and give listening impressions.

 

[Tomcat1969]

I re-wired the thing this afternoon and it's all good. Very good in fact.
Iistening to a U2 cd and it's really enjoyable and I'm more of vinyl guy. New guitar parts coming through, good bass slam. A bigger, wider soundstage. Wow!

Big thanks to Papa Pass!

And thanks to ZM and ixnay for jumping in to help last night.

 

[Zen Mod]

I didn't do anything

just asked for pics and brain, as usual

 

[Tomcat1969]

Yeah, I know. But you were ready to. That's what counts.

 

[Tomcat1969]

And a nods as good as a wink to a blind bat.

 

[Tomcat1969]

I've a question gentlemen.

Can I use the power supply that's in the BA3 as a pre?

Specifically can I just use the +24v output and it's ground from the regulator board?

If so what do I do with -24v/ground side?

Thanks in advance.

 

[Tomcat1969]

Of course I mean "BA3 as preamp".

 

[Ben Mah]

What power supply is it, and will it be only powering the B1 Korg?

It probably will work, and the V- would remain unused, but more information needed.

 

[Tomcat1969]

Thanks Ben.

It's a cheap regulator board that allows a variable output powered with a potted toroid.

It will only be powering the B1K.

What else do you need to know?

I wondered if perhaps I would use a resistor as a dummy load for the -24v rail.

 

[Vunce]

Don't populate or power the -V rail, just use the +V side.

 

[Ben Mah]

It will most likely be ok. You can test the V+ only if you wish. The B1 Korg draws about 60mA so a 400R resistance will be a good test load. Dissipation is about 1.5W so a series or parallel combo of resistors will work unless you have the value in 3W or higher.

 

[Tomcat1969]

Right guys.

Ben, I will test the output. I'll have to check my resistor box and see what I have.

Vunce, yeah I suppose I could do that. Just disconnect one of the secondaries from the regulator board and make them safe. Then just use the +24v and corresponding ground.

Is that right?

Thank you. :0)

 

[Ben Mah]

Ah, more information. If the PS has separate secondaries for V+ and V-, disconnect the V- secondary if you don't need V-.

 

[Tomcat1969]

OK. Thanks you guys. It's a job for tomorrow.

 

[Ixnay]

Wait, wait. Whad I win? But nah, soldering can be deceiving. I trust it less than I used to and so I make a solid mechanical connection for wiring, and then solder it these days.

 

[Tomcat1969]

Thanks for the advice gentlemen. I now have the B1K up and running with no problems.

I've put it in the case that my BA3 was in, so I'm using the B1K with a good quality stepped attenuator and PSU.

It's very, very nice. Thank you all.

 

[spoiler]

Hi all, getting started on my second iteration (trying some upgrades). I’ve got a stash of vishay dale resistors, but they are all 1/8 watt. I read somewhere (here or another thread) that the 1/8 watt dales were “military spec,” and would really be 1/4 watt in any normal application. Is this true? If so, i assume they’d be good for the B1 K? Thanks in advance!

-Robert

 

[Brijac]

Yes they are good
Except for 3W one 😁