Twist Turner
Well-known member
Hi Guys,
I'm finally getting around to building something from scratch again. I have my Pultec EQP-1a nearly completed. Used the original tube design as diagramed by Cayocosta. I used a HS66 input, and Sowter interstage, output and inductor.
I just got it done and fired it up(no smoke!). At first no signal, but after about 4 hrs I tracked down 1 misplaced wire. I've been over everything else with a fine tooth comb and I don't think I'm getting any make up gain. I'm a good 15db below what I put in there whether in bypass or not. I am getting signal and the eq section is working(and sounds great too)
Is there somewhere specifically I should be looking? I know the diagram is a little vague when it comes to the transformers, but I think with the help of the schematic I have that worked out. The tubes all test good and no shorts. I've got a feeling my problem is possibly in the interstage or output hook up. Any ideas where to start. I can only give this one more day and then I'll turn it over to my tech, but I'd rather solve it myself if at all possible.
I also just noticed I could hook up the output secondarys at 10:1 or 5:1 I have them as 10:1 right now, is this ok.
Also I'm running the input in at 600 ohms should I possibly switch that to 250 or 150ohms input???
I'm finally getting around to building something from scratch again. I have my Pultec EQP-1a nearly completed. Used the original tube design as diagramed by Cayocosta. I used a HS66 input, and Sowter interstage, output and inductor.
I just got it done and fired it up(no smoke!). At first no signal, but after about 4 hrs I tracked down 1 misplaced wire. I've been over everything else with a fine tooth comb and I don't think I'm getting any make up gain. I'm a good 15db below what I put in there whether in bypass or not. I am getting signal and the eq section is working(and sounds great too)
Is there somewhere specifically I should be looking? I know the diagram is a little vague when it comes to the transformers, but I think with the help of the schematic I have that worked out. The tubes all test good and no shorts. I've got a feeling my problem is possibly in the interstage or output hook up. Any ideas where to start. I can only give this one more day and then I'll turn it over to my tech, but I'd rather solve it myself if at all possible.
I also just noticed I could hook up the output secondarys at 10:1 or 5:1 I have them as 10:1 right now, is this ok.
Also I'm running the input in at 600 ohms should I possibly switch that to 250 or 150ohms input???