bjosephs
Well-known member
Hi All,
I have a 50W (6L6 push/pull) guitar amp with some undersized iron on the output. I've built a few amps, have several transformers in inventory for/from various projects, and from past experience I'm fairly confident that upgrading it won't be waste of money if I pick right. Nothing I have on hand is a fit electrically and very few of the transformers I can find in the wild will fit mechanically given the way they laid out the chassis. So I'm talking with a small shop about a custom that would be a variant of a HiFi transformer they make.
The original is a 4k4:8/4 probably only a couple lbs at most with rough dimensions in the attachment. This is a Mesa Single Rectifier Series 2 for the curious.
The goal is to get closer to the rated power of the amp at 60Hz instead of all the bass flattening out with the volume up. I have a 2xEL34 amp on the bench using a 15W Hammond 1650E that thumps more at half the nominal power. I attribute this to a core that can handle the energy.
The custom is going to be 4k2:8/4 rated nominally at 60W on a 3x3.5" EI core (that's outside dims, described in the quote as 1.125x1.5" which I believe is the size of the middle arm of the "E"), 2.5" over the windings, 25H inductance, between 4 and 4.5lbs. I'm hoping someone with better instincts or experience could tell me if the quoted specs sound like they might get me in the ballpark of my goal. I have testimony from the designer but I'd like some outside advice.
The alternative is using a smaller wattage hifi Hammond unit that will fit in this spot, perhaps after rotating 90 degrees. A couple in the 15W range would fit and I *think* that 15W at 30Hz means around 30W capability at 60Hz give or take.
Thanks,
Brian
I have a 50W (6L6 push/pull) guitar amp with some undersized iron on the output. I've built a few amps, have several transformers in inventory for/from various projects, and from past experience I'm fairly confident that upgrading it won't be waste of money if I pick right. Nothing I have on hand is a fit electrically and very few of the transformers I can find in the wild will fit mechanically given the way they laid out the chassis. So I'm talking with a small shop about a custom that would be a variant of a HiFi transformer they make.
The original is a 4k4:8/4 probably only a couple lbs at most with rough dimensions in the attachment. This is a Mesa Single Rectifier Series 2 for the curious.
The goal is to get closer to the rated power of the amp at 60Hz instead of all the bass flattening out with the volume up. I have a 2xEL34 amp on the bench using a 15W Hammond 1650E that thumps more at half the nominal power. I attribute this to a core that can handle the energy.
The custom is going to be 4k2:8/4 rated nominally at 60W on a 3x3.5" EI core (that's outside dims, described in the quote as 1.125x1.5" which I believe is the size of the middle arm of the "E"), 2.5" over the windings, 25H inductance, between 4 and 4.5lbs. I'm hoping someone with better instincts or experience could tell me if the quoted specs sound like they might get me in the ballpark of my goal. I have testimony from the designer but I'd like some outside advice.
The alternative is using a smaller wattage hifi Hammond unit that will fit in this spot, perhaps after rotating 90 degrees. A couple in the 15W range would fit and I *think* that 15W at 30Hz means around 30W capability at 60Hz give or take.
Thanks,
Brian