Muzzle won’t power on

[Rando_calrissian]

I just finished the build but it won’t power on where should I start?

 

[Rando_calrissian]

Pin 5 goes directly to the Collector of Q2.
What voltage is at Pin 8 of LT1054

8.71vdc

 

[Robert]

Pin 5 of the LT1054 should be around -9V.

More importantly, where did you get your THAT4301? That doesn't look like a genuine IC.

 

[Rando_calrissian]

The only place I could find them was eBay could that be causing all the issues?

 

[Robert]

It's very likely.

Just for the heck of it, pull out the THAT4301 and then measure the voltage on pin 5 of the LT1054 again.

 

[Rando_calrissian]

It's very likely.

Just for the heck of it, pull out the THAT4301 and then measure the voltage on pin 5 of the LT1054 again.

Replaced the lt1054 and now I’m getting -6.68v

 

[music6000]

Remove the THAT4301 & see what voltage, you should be getting -9v!

 

[Rando_calrissian]

Remove the THAT4301 & see what voltage, you should be getting -9v!

With the chip pulled it’s -8.35

 

[music6000]

That's more in line with what you are getting at Pin 8 of the LT1054.
What type of Power supply are you using?
THAT4301 seems to be drawing too much voltage!

 

[Rando_calrissian]

Using a planet waves power supply but it seems as though my eBay that4301 is the issue and now I’m having trouble sourcing another

 

[music6000]

What country are you in?

 

[Rando_calrissian]

What country are you in?

United states

 

[Robert]

This is what the THAT4301 should look like. They're out of production and have become pretty hard to find over the past year.

 

[Rando_calrissian]

From all my searching it doesn't look like I can get any at this time

 

[Rando_calrissian]

From all my searching it doesn't look like I can get any at this time

Saw some post about alibaba clones that work but you have to order a minimum of 5 at 17 dollars each

 

[music6000]

I have used this site & Hector has always sent genuine parts.
Contact him to send a picture to be sure!

THAT4301P20-I / THAT 4301 That Corp.,DIP20.

THAT4301P, THAT Analog Engine® IC Dynamics Processor. ThatCorp, DIP20

www.retroamplis.com

 

[music6000]

Try this first, There in your country :

that4301p Search Results | Utsource

Search that4301p in Utsource, view stock, price, datasheets and sourcing options for electronic components.

www.utsource.net

 

[Rando_calrissian]

I have used this site & Hector has always sent genuine parts.
Contact him to send a picture to be sure!

THAT4301P20-I / THAT 4301 That Corp.,DIP20.

THAT4301P, THAT Analog Engine® IC Dynamics Processor. ThatCorp, DIP20

www.retroamplis.com

That’s 30 dollars is without shipping

 

[Rando_calrissian]

Bit the bullet and it finally arrived but I’m still having issues the voltages are as follows ic1 tc1044

1-8
8.7,5.03,0,-3.313,-7.98,3.988,5.511,8.70

ic 2 that4301
1-20
0
.036
0
-.069
.885
0
-.439
0
0
-7.89
8.7
-0.002
0
-.440
-.440
0
.002
2.552
.001
0

Ic3 tl072cp
1-8
.005
.005
0
-7.89
.001
.001
.001
8.71