Neve 2254 rewire

[Rob Flinn]

Ah ok, BC560C should work as well though right?

Or what’s another one that would work?

BC560c should work well.

 

[Rob Flinn]

But if you check data sheets it looks like a BC560c has the pins the other way round to the BC214c.

 

[Spencerleehorton]

It would totally make sense that the weird nearly working of the unit is down to the pnp transistor not being right.
I’ll take a photo of the bc214s I have and check the pins on my trany tester

 

[Rob Flinn]

But if you check data sheets it looks like a BC560c has the pins the other way round to the BC214c.

Just be really sure of your orientation if you asubbing transistors, it can save a lot of time later.

 

[Spencerleehorton]

I thought I had to be fair but didn’t realise there was another variant which had a completely different pin out!!
I’m fairly sure that mine is a bc214b and not a bc214L, will check in the morning.
As you look at the flat face of it emitter is on the left, base mid leg, right collector.

 

[Spencerleehorton]

It’s says CTBC214BLS on the transistor?

I have some bc557 here I will try as these other ones could be knock offs!!

 

[Spencerleehorton]

Yeah my problems lie with TR5 on ba185 which I’ve labelled T6 on the collector is meant to be 0.2v and I’m getting 12v so definitely will change this for another pnp and see what I get.
Will look at the other PnP transistors as well.

 

[Spencerleehorton]

Top image is the new voltages bottom images is the old voltages.
TR5 is the pnp transistor and now seems to have correct voltages with using the bc557

 

[Rob Flinn]

TR2 on the BA185 looks a bit suss from the BE voltages.

 

[Spencerleehorton]

As in it would normally be 0.6v difference right?

 

[Rob Flinn]

As in it would normally be 0.6v difference right?

Likely.

 

[Spencerleehorton]

finally have changed the 3 x PNP transistors and it all comes to life, works perfectly!!!

what i nightmare!!!

must have all been either fakes or faulty?

 

[Spencerleehorton]

if anyone needs any voltages i can get them all while this is being sorted, just let me know.

 

[richiyobs]

if anyone needs any voltages i can get them all while this is being sorted, just let me know.

Yes, why not? it s a reference for everyone interested...
great Job!
best

 

[Spencerleehorton]

yep, plugged it all in and ran some drums through it, sounds great, much lower noise now ive used the screen leads in the correct place!!!
Seem to setup easier now and i have very similar channel behaviour.
Ltspice is definetly going to be used a bit more in the future, what a help, and thanks to everyone else for helping, 2254 headache gone now, back to the U47 p2p with the EF14!!!!

 

[Spencerleehorton]

Here is a little test.

 

[richiyobs]

Yooooo
It s alive! Congratulations

 

[Spencerleehorton]

there is a setting on the limiter where you put it to the fastest release and have output control up high which is really nice on the drums, havent found this setting before, its like the nuke setting on the 1176, very cool

 

[pvision]

Always impressed by your never-say-die approach! You do not give up easy