An Attempt At Fisher 400C Transformation...
- Thread starter Tysen
- Start date
Tysen
Active Member
Unless someone points out an issue with my voltage readings, I think that's a wrap until I tackle the phono section in the upcoming weeks. The bulbs, it turns out, were arcing. Once I widened the sockets (thanks @RUmad!) and tightened them (5 fried bulbs later), no trouble in sight. I removed the top cover for better access and that enabled me to tighten with my pliers without the bulbs separating from their base.
I also installed new AC lines and a lamp switch to preserve the internal power switch (not grounded to the chassis).
Tomorrow I'll run the pre through my MC30s and report back (with better photos). VERY excited. Hopefully things have quieted down!
I also installed new AC lines and a lamp switch to preserve the internal power switch (not grounded to the chassis).
Tomorrow I'll run the pre through my MC30s and report back (with better photos). VERY excited. Hopefully things have quieted down!
Tysen
Active Member
Thanks @RUmad
It feels so good—this has been my toughest project to date, so it's that much sweeter!
@dcgillespie Thank you so much for doing all that ground work, and for offering me some guidance along the way. I'm very appreciative.
After listening to some vinyl for a couple of hours today, I will say that the phono section does lacks some low-end, and the highs are little more accentuated than what I'm used to. Can't wait to tackle the phono section mod. To be continued.
It feels so good—this has been my toughest project to date, so it's that much sweeter!
@dcgillespie Thank you so much for doing all that ground work, and for offering me some guidance along the way. I'm very appreciative.
After listening to some vinyl for a couple of hours today, I will say that the phono section does lacks some low-end, and the highs are little more accentuated than what I'm used to. Can't wait to tackle the phono section mod. To be continued.
Glad it's working well for you! My 400C is still my favorite pre.......
Dave
Dave
Tysen
Active Member
Lol. Yeah. MC30s are the best. I think I'd sell everything else in my system before I'd sell them.
So glad it's working well...thanks to you. Seriously, you should start some sort of donations account that we can donate to. Both my systems (bedroom, Magnavox 93xx) and now my main system hold your stamp!
Tysen
Active Member
Hi Folks,
Well, I've been the fisher since May and I love it.
Here's an issue I never posted about: I get no sound out of Aux 1. Tuner and Aux 2 play perfectly. I also only get sound out the left channel out of phono section (both inputs). I've triple checked everything coming from the turntable—all wires are good. Should I clean the contacts on the selector? Because I get great sound from Tuner and Aux2, I'm assuming I just need to clean something.
Any guidance would help.
Best,
Tysen
Well, I've been the fisher since May and I love it.
Here's an issue I never posted about: I get no sound out of Aux 1. Tuner and Aux 2 play perfectly. I also only get sound out the left channel out of phono section (both inputs). I've triple checked everything coming from the turntable—all wires are good. Should I clean the contacts on the selector? Because I get great sound from Tuner and Aux2, I'm assuming I just need to clean something.
Any guidance would help.
Best,
Tysen
For starters, make sure that the Aux 1 and Phono level controls in both channels are turned up full (as a starting point anyway). These are recessed behind four small holes, with two on either side of the top of the push-button switch cover, and take a medium size jeweler's flat head screwdriver to adjust.
Let us know!
Dave
Let us know!
Dave
Should I perhaps get some rubbing alcohol and clean the selector contacts?
As you face the shaft, like any level/volume control, you advance the level with clockwise rotation, while counter clockwise reduces it. Full counter clockwise rotation should result in no signal -- unless the controls are wired backwards.
Dave
Dave
Rubbing alcohol will just polish the Environmental crud that has built up on the switches/contacts. You need to get a can of CAIG "DE-OXIT" DN5 and a can of "FADERLUBE" F-5. The DN5 will soften the crud and with friction will clear it off the contacted area leaving a CLEAN CONTACT. Finish off with the Faderlube to lubricate it as the DN5 washes out a lot of the origina llubricants also. Read this thread.......... http://audiokarma.org/forums/index.php?threads/the-idiots-guide-to-using-deoxit-revisited.207005/ in the General Audio Forum.
