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May 28, 2022, 01:04:39 AM

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Recent posts

#1
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by g1 - May 27, 2022, 11:17:58 PM
Double check those collector voltages for Q8 and Q9.
Where could they be getting a voltage higher than the base voltages of the outputs?
(ex. Q1 base is 1.2V, Q8 collector gets voltage from that line)
#2
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - May 27, 2022, 04:23:09 PM

Q8
E-00.03
B-00.09
C 02.92

Q9
E-00.04
B 00.02
C-02.59
#3
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - May 27, 2022, 04:07:35 PM
Q1
B01.22
C39.22
E-00.02

Q10
B01.22
C39.20
E-00.02

Q11
B-01.19
C-39.47
E-00.05

Q2
B-01.19
C-39.44
E-00.05

All without speaker load
#4
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by g1 - May 27, 2022, 03:40:20 PM
Good so far. 
How about DC voltages for E,B,&C of Q1,Q10,Q2,Q11
Also Q8 and Q9
#5
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - May 27, 2022, 02:58:21 PM
-0.042 cr14 cathode with load
-0.044 cr13 anode with load
0.016vdc u1 pin6 with load
#6
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - May 27, 2022, 02:31:38 PM
-0.036vdc at cr14 cathode and cr13 anode without load.

00.22vdc on pin 6 of u1 without load
#7
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by g1 - May 27, 2022, 01:51:20 PM
Confirm that CR14 cathode (or CR13 anode) is still 0VDC with no load connected.
If so, connect load and recheck.
Also check DC volts at pin6 of U1.
#8
Amplifier Discussion / Re: New Gamma SS Amps
Last post by Frank_NH - May 27, 2022, 10:52:38 AM
Here is good review of the Gamma amps from Phil McKnight:

https://www.youtube.com/watch?v=zEXJeIlewNg

All solid state *analog* is now a selling point!

The amp seems OK though they should have added a reverb (which probably wouldn't have increased the cost too much).
#9
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - May 27, 2022, 10:19:36 AM
Can confirm same sound with guitar plugged into power amp in, but sound is slightly quieter.
#10
The Newcomer's Forum / Re: Fender Roc Pro 700 Reverb/...
Last post by Enzo - May 26, 2022, 10:22:36 PM
With NO footswitch, does the channel select switch work?   And does the reverb work?

What resistor that connects to the rest of the amp?  You mean R110?   Please use part numbers.  If R110, is there about 30vAC on one end?

Not sure why we would change a bunch of diodes.

Look at your schematic, at the footswitch circuit.  See all those test points with voltages for switching conditions?  How do your voltages compare?