Looking for Owners Manual and Service Manual for a GB 150 Solid State Linear

[danmcclain]

Looking for any and all information on a GB150 Solid State Linear pictured below....Thank you.... Dan

 

[AudioShockwav]

Dan, I have never seen a service manual for any Grey amp.
There is a thread here somewhere that talks about one but they were like most CB amps back in the day.
I will look for the thread

73
Jeff

 

[AudioShockwav]

Gray Electronics Three Hundred Bi Linear into needed

I brought back into service an old Gray Electronics amp, looks like someone hooked it up backwards and burned traces off the board and then cannibalized the switches, but its fixed now. I cannot find any information on it, would like to know how much current this thing will draw on max power...

www.worldwidedx.com

Might be more here

Thread about the mobile, the base has a crude un regulated power supply.

73
Jeff

 

[danmcclain]

Dan, I have never seen a service manual for any Grey amp.
There is a thread here somewhere that talks about one but they were like most CB amps back in the day.
I will look for the thread

73
Jeff

Jeff thanks for the info... Dan

 

[AudioShockwav]

The 150 most likely has two MRF 455 or something along those lines.

Nomad I am sure is familiar with these

73
Jeff

 

[nomadradio]

Nomad I am sure is familiar with these

Yep. The toroid power transformer is woefully undersize. The DC voltage on standby is over 20 Volts. Drops to around 12 under load. The high standby voltage tends to cause RF transistors to fail, frequently as you unkey. We learned to insert a 30-Amp "Bosch"-type automotive relay between the DC power and the amplifier board. Added a transistor to carry the load of the added relay's coil, and drove the transistor from the original relay circuit. This will remove DC power from the RF transistors in receive mode.

It's a bit like a small mammal. High metabolic rate, short life.

73

 

[danmcclain]

Yep. The toroid power transformer is woefully undersize. The DC voltage on standby is over 20 Volts. Drops to around 12 under load. The high standby voltage tends to cause RF transistors to fail, frequently as you unkey. We learned to insert a 30-Amp "Bosch"-type automotive relay between the DC power and the amplifier board. Added a transistor to carry the load of the added relay's coil, and drove the transistor from the original relay circuit. This will remove DC power from the RF transistors in receive mode.

It's a bit like a small mammal. High metabolic rate, short life.

73

Thank you for the info... Dan

 

[brandon7861]

Not sure if you already have this, but the schematic was on CBTricks

 

[danmcclain]

Not sure if you already have this, but the schematic was on CBTricks

Thank you Brandon... Dan