I just built a amp that the schematic called for a 1446 for the first stage. I had several 2879's so I used one and ended up with one 2279 driving two 2879,,,
the first thing i noticed was not enough power coming from amp 175 watts. I have a bird 43 but only have a 100 watt slug...my cheap radio shack meter is calabrated the same as 100 watts on the bird....dont know how accurate the r.s. meter is at 200 but is good at 100watts.
I took off one resistor off then the other one between stages....i also bypassed trim cap. between stages.
I took the resistor off the var switch on the high side.
It is now doing over 220 real watts if my meter is right with 8 watts input and 17 volts after keying from power supply.
should I expect more? seems like I have seen this combo doing more. The pills are just warm after long trans at full power. It seems like the 2879 should drive the secondary more than the 1446. I used the same ferite transformers and windings for the 1446.
any suggestions please
I also want the simple bias with thermal control.....diode on top of pill or something....once there was a post on this.
god bless
davis
the first thing i noticed was not enough power coming from amp 175 watts. I have a bird 43 but only have a 100 watt slug...my cheap radio shack meter is calabrated the same as 100 watts on the bird....dont know how accurate the r.s. meter is at 200 but is good at 100watts.
I took off one resistor off then the other one between stages....i also bypassed trim cap. between stages.
I took the resistor off the var switch on the high side.
It is now doing over 220 real watts if my meter is right with 8 watts input and 17 volts after keying from power supply.
should I expect more? seems like I have seen this combo doing more. The pills are just warm after long trans at full power. It seems like the 2879 should drive the secondary more than the 1446. I used the same ferite transformers and windings for the 1446.
any suggestions please
I also want the simple bias with thermal control.....diode on top of pill or something....once there was a post on this.
god bless
davis