Dave Made straight 4

[TIN_CAN]

I picked up a Dave Made 4 pill, looks to be an older one by looking at the front of it, in good physical condition with original Toshiba 2879's. But from what I have found online is that DM amps were class C only, but this looks to be set up for ssb? anyone confirm this. Even has a blue pimped out fan that is really quiet. Was planning to drive this with around 50W pep and run it in my f150.

Cheers!

 

[9C1Driver]

It's probably still class C, they just added a SSB delay or someone did anyway. It will still sound rough on SSB.

 

[DoctorAudio]

Might want to take the wirewound resistors off of the splitter/combiner and feedback and replace them with metal film. Inductive resistors here are a no-no.
It is still class C.

 

[TIN_CAN]

Thanks, just confirms what I thought ...that its still a class C amp.

 

[nomadradio]

that its still a class C amp.

Consider that adding bias for sideband may also lead to stability trouble.

Might, might not. But this amplifier has one design goal: max wattmeter reading.

Stability is not high on the priority list.

Then again, it you mod it for sideband bias and it gets squirrelly you can always unhook that stuff and put it back to class C.

73

 

[TIN_CAN]

Consider that adding bias for sideband may also lead to stability trouble.

Might, might not. But this amplifier has one design goal: max wattmeter reading.

Stability is not high on the priority list.

Then again, it you mod it for sideband bias and it gets squirrelly you can always unhook that stuff and put it back to class C.

73

Thanks Nomad I planned on using this with a ssb radio but if it sounds to much like crap on air it will go in the closet, I paid $250 Canadian, I guess I have 4 matching toshibas for back up for my palomar 6500R if they ever fail.

 

[S&W357]

I've got a somewhat similar Dave Made amp. This one has only two Toshiba SC2879 red dots but it is a base amp with an iron core transformer. I use it on SSB with a Anytone AT-6666. I get good reports on audio from both locals and on DX.

Clean? I dunno.

 

[Shockwave]

Might want to take the wirewound resistors off of the splitter/combiner and feedback and replace them with metal film. Inductive resistors here are a no-no.
It is still class C.

This is important. Especially in the negative feedback circuit which, may not even be functioning at all with wire wound resistors. RF sees this as a choke, only with even more resistance due to the wire used. Instead of looking like 100 ohms, it could be 10 times higher at RF.

 

[TIN_CAN]

I've got a somewhat similar Dave Made amp. This one has only two Toshiba SC2879 red dots but it is a base amp with an iron core transformer. I use it on SSB with a Anytone AT-6666. I get good reports on audio from both locals and on DX.

Clean? I dunno.

View attachment 43762

I heard you with that 2 pill sounded fine to me.

 

[Shockwave]

I've got a somewhat similar Dave Made amp. This one has only two Toshiba SC2879 red dots but it is a base amp with an iron core transformer. I use it on SSB with a Anytone AT-6666. I get good reports on audio from both locals and on DX.

Clean? I dunno.

View attachment 43762

The way things are going, soon the ammo in the background, may be the most valuable thing in the photo. That wasn't meant to take anything away from the amplifiers either.

 

[snippits75]

The way things are going, soon the ammo in the background, may be the most valuable thing in the photo. That wasn't meant to take anything away from the amplifiers either.

You got that right!

 

[lonestarbandit]

LOL