Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

*Solved Minerva Tropic Master model w117 "early"-crackle pop & no vol ****SOLVED
#32

resistance checks done from chassis to each 6sq7 pin
*removed all tubes to help isolate the readings
**if tube needs to be in, then tell me
results
1=0/chassis
2=9.9M
3=0/chassis
4=4.5M
5=790k
6=8.3M
7=open
8=25.8ohms


now to part 2,,,, WHICH JUST NOW really sucked!,,, "disconnect pins 4 & 5 connections"
-powered up and within 10 seconds the rect tube glowed that purdy blue "ish" color
then.................
-the 25ohm resistor on the N leg of my power cord to chassis blew a hole out the side of it letting out all the air and smoke. I tried fix a flat and the hole in the resistor still remains!

this is one of those perfect examples where i need to learn exactly what i can actually disconnect and what i cant with power applied.

the bright side is yes the radio did remain silent but its a foul ball because nothing really had time to warm up yet before the smoke.

with pins 4 & 5 empty on the 6sq7, i think that allowed the rect tube and the 25ohm resistor to become the path of least resistance.

what next?


Messages In This Thread
RE: Minerva Tropic Master model w117 "EARLY" - by jcassity - 06-27-2018, 11:09 AM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1793 online users. [Complete List]
» 1 Member(s) | 1792 Guest(s)
Avatar

>