SOLVED: Built Two Bo Hansen DIs- both distort very quickly

[Newmarket]

It's a poorly biased voltage amplifier if you switch the two transistors by accident, as the OP has. If they're in the correct positions, it's all golden.

Right. Thanks. I read it as switching from the incorrect (wrt NPN / PNP) to the correct configuration.

 

[Ricardus]

Switching the 2 transistors will turn the box in a poorly biased voltage amplifier.

I too am wondering what he means by this. I can't really parse the meaning.

 

[Mr. Moscode]

It's a poorly biased voltage amplifier if you switch the two transistors by accident, as the OP has. If they're in the correct positions, it's all golden.

Exactly! Money on problem solved. I think I worded my answer poorly. I should have said "Switching the transistors, as you seemed to have done by accident, has resulted . . .

Polarity counts!

 

[Mr. Moscode]

Did you fix it yet?

 

[Ricardus]

Just in case I need to unsolder them, like now.

What method are you using for unsoldering them?

 

[Ricardus]

Polarity counts!

Only if you don't like magic smoke!!!

 

[PhilipMarlowe]

Did you fix it yet?

unfortunately I have no local supply shop so I have to order online. It might take up to a week, but it seems you guys solved the issue. Can't wait to hear what it sounds like!
I'm very impressed by the gain in high frequency clarity when audio passes through Lundahl Transformers. It does something very pleasant sounding and somehow also reduces digital harshness that is mostly in the upper mid range, so when you limit in the DAW the end result is alot less harsh on the ears. Almost magic!

 

[ccaudle]

I have to order online

Just take the transistors out and put them in the correct locations.

 

[PhilipMarlowe]

Just take the transistors out and put them in the correct locations.

I have only transistors of the same types (B557)- I did not order B550 or B560 types. I am in europe and I couldnt use the preconfigured mouser basket since many parts were backordered.

 

[PhilipMarlowe]

What method are you using for unsoldering them?

I have desoldering wick

 

[Ricardus]

I have desoldering wick

Cool. Ideally you will want to get a good desoldering gun someday, but adding a solder sucker to your arsenal for now would also be useful.

 

[ratrace]

I have only transistors of the same types (B557)- I did not order B550 or B560 types. I am in europe and I couldnt use the preconfigured mouser basket since many parts were backordered.

i got some bc550 npn and i'm in europe, i could send you 2 if you don't already order them.

 

[PhilipMarlowe]

i got some bc550 npn and i'm in europe, i could send you 2 if you don't already order them.

thank you, i just ordered some already.

 

[PhilipMarlowe]

Exchanged the transistors with the correct ones and now it works flawlessly! Only need to find a fitting case for a stereo unit cause I miscalculated the width haha. Thanks everyone for the trouble shooting. It sounds amazing! Even better than the RNDI I tried out to be honest.