Help with active loop kit connection?

[fitz]

Need some assistance from the brain trust...
This is for my Ceriatone JTM45.
It currently has the (line level?) loop as shown in this diagram:



I've received the passive loop kit from Nik as shown in this diagram:
(sent to me as just parts, and we will assume for now that I assembled it correctly...)



So, here's my question:

Where does the connection "HT (PI Supply)" go?
I'm not confused about any of the other connections.

T.I.A.

 

[fitz]

Here's a pic of the actual amp, if it's of any use.

 

[TheKman76]

 

[TheKman76]

Take your pick.

 

[TheKman76]

Nice work, by the way. I see you've added a PPIMV. Any other mods?

 

[Ronquest]

looks like your going to tap off the 16 uF cap, that's the one feeding your PI.

 

[fitz]

Nice work, by the way. I see you've added a PPIMV. Any other mods?

Not my doings - the MV was a factory option by the original owner.
I've sent pics to Nik, and he has verified that they assembled the amp, and it wasn't a kit build or an MV mod.

 

[TheKman76]

Well, congratulation to Nik and his team, that looks awesome.

Nice find!

 

[Ronquest]

Test your voltage there so your in range 280-320V. If your voltage is too high you'll need to add a resistor before the circuit board. 16uF cap > resistor > board. Hope that makes sense. I've run them lots lower and been fine.

 

[fitz]

@TheKman76 & @Ronquest
Thanks guys!

I had also emailed Nik - but didn't expect to hear back for a day or so.
He just replied and you guys are spot on:
"...at the meeting of the 100K/82K PI plate resistors...also connected to the 10K resistor before the filter cap for the preamp (16uF)"

 

[fitz]

Test your voltage there so your in range 280-320V. If your voltage is too high you'll need to add a resistor before the circuit board. 16uF cap > resistor > board. Hope that makes sense. I've run them lots lower and been fine.

Getting 310v reading.

 

[Pete Farrington]

I've received the passive loop kit from Nik

The loop was passive, the kit you’ve got is an active loop, LND150s being the active devices
Good luck!

 

[fitz]

The loop was passive, the kit you’ve got is an active loop, LND150s being the active devices
Good luck!

Thanks Pete, I guess that makes sense.

Well, I think I hooked it up...
Probably not the most beautiful wire dress, but ya' know, I'm an accountant...
No instructions on setting the trim pot.
Suggestions welcome.

Going to hook up a speaker while it's inverted in the stand and try it out after some dinner.

 

[Ronquest]

Just a guess for that loop, but adjust the trim pot so that gain is unity with loop on vs bypassed (switch) .

 

[Central Scrutinizer]

Cool amp Fitz!

Nik is an amazing guy. Top-notch Customer Service from everything I have read. Quite a company he has there. I had a Super Lead I bought second hand that was a factory build. Amazing quality.

Enjoy the amp.

 

[fitz]

Just a guess for that loop, but adjust the trim pot so that gain is unity with loop on vs bypassed (switch) .

The trim was set to minimum, so I turned it up till the amp sounds good without overdriving the loop effects.
Bypass sounds like 0.1w mode - almost no sound.
Checked the schematic and I missed that little connection between the two sides on the bypass off position...

 

[fitz]

The trim was set to minimum, so I turned it up till the amp sounds good without overdriving the loop effects.
Bypass sounds like 0.1w mode - almost no sound.
Checked the schematic and I missed that little connection between the two sides on the bypass off position...

Was able to wiggle out the bypass switch and add that little connector.
LOL, rookie mistake...
Sonds like it should - backed the trim down just a smidge to unity volume with the loop on/off.
Thanks all for the assistance!

 

[fitz]

Cool amp Fitz!

Nik is an amazing guy. Top-notch Customer Service from everything I have read. Quite a company he has there. I had a Super Lead I bought second hand that was a factory build. Amazing quality.

Enjoy the amp.

Thanks!
Got the amp 2nd (maybe 3rd) hand from Reverb.
Factory sticker says it left there as a combo with the front panel MV.
Guy I got it from had it in an ugly carbon fiber Mojotone small box shell.

I have nothing but good things to say about Nik.
He knows I'm not the original buyer and still seems to go out of his way to respond to me like I'm the best customer he's ever had.

 

[TheKman76]

Clearly I've been underestimating Accountants my entire life... Or are you the exception?

 

[fitz]

Clearly I've been underestimating Accountants my entire life... Or are you the exception?

LOL, took me the better part of the afternoon to sort out the bag of those striped electrical thing-a-ma-jiggers and look up pics of all the specs on the diagram and match all those little stripes under a magnifying glass before I soldered them into the tiny little empty PCB.
Most accountants are probably smart enough to just pay someone else that knows WTF they're doing.