Maestro PS-1A V2

Video and pictures of the V2 zeta-sound clone of the Maestro PS-1A phase shifter.

Mainly changes made in the main circuit board layout , allowing the stompswitches a bit more centered and using onboard in/output jacks. The speed selector circuit works the same as in V1, tap the switch and change the speed through three presets. Blue -> Slow, Green -> Medium, Red -> Fast.

Stepping through the three speeds.
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2 clone
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2
MaestroPS-1A Clone zeta-sound
Maestro PS-1A V2 guts
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2 circuit board

/Krister

Marshall 2205 service

JCM 800 2205 dated 1987.

Marshall 2205 service
Marshall 2205

Since about 30 years old and last known service dated from 1998 with new output tubes, it now got all them electrolytic caps changed and a new pair of EL34 power tubes.

Marshall 2205 service
Last known service note

New F & T cap vs old one.

Marshall 2205 caps
caps

A pair of caps hidden under the circuit board.

Marshall 2205 caps
caps

Guts after service, only mod is 1 ohm bias resistors added.

Marshall 2205 service
Marshall 2205 service

/Krister

Spare parts

Received a shipment with parts for a Marshall 2205. Thumbs up for Tube-Town, they sent chocalate with the package!

Parts Marshall 2205
Marshall 2205 parts with chocolate

/Krister

Seimens tube amp mod

The channel switching mod to the old Siemens 6 S Ela 2427c installed. The optocouplers circuit board found a place.

Siemens 6 S Ela 2427c
Siemens 6 S Ela 2427c guts

Another view, on the left is the input jack, switch for channels and a remote jack for channels.

Siemens 6 S Ela 2427c
Siemens 6 S Ela 2427c guts

I removed the guts from the pilot lamp and installed the channel indicating leds in it. We can see the two new pots installed, a clean volume pot and a mids pot.

Siemens 6 S Ela 2427c
Siemens 6 S Ela 2427c front

Another view where you can see the new wiring to the old pilot lamp now acting as channel indicator.

Siemens 6 S Ela 2427c
Siemens 6 S Ela 2427c top

/Krister

Laney Klipp100 modified

Laney Klipp100 amplifier after modification. The master volume pot was a mod already made. It now holds a switch for channel selection, a 6,3mm jack for remote channel switching and indicating leds for each channel.

Laney Klipp100 front panel
Laney klipp100 front

Back of the amplifier. Bias pot, bias measuring points , effects loop with send level pot and a gain switch.

Laney Klipp100 back panel
Laney Klipp100 back

Here’s an image with the channel switching circuit board installed using optocouplers .

Laney Klipp100 channel switching
Laney channel switching

A closer look at the gain switch mod and the effects loop.

Laney Klipp100 Gain switch
Laney gain switch

Here’s an image of the bias pot with measuring outlets and the transformer for the channel switching circuit,

Laney Klipp100 channel switching transformer
Laney klipp100 power

/Krister