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I was referred to this site from the 18-watt.com site looking for a more Vox sounding small amp and was told to look into the Lightning 15. After looking around on this forum, I am getting ready to build a Lightning and had some questions on input and output transformers. Is there that much of a difference between the S2 transformers and Hammond transformers? I was thinking of using a hammond power transformer such as the P-T270FX (275v - 150ma) and a VOX Output Transformer for a AC15. Both of these are available locally at Antique Electronics. Would this be a good way to go or should I pop for S2 or Heybour transformers? What are your thoughts?

Thanks,

Dan

The Lightning counts on a high voltage. The Hammond is too low in my opinion. The OT you suggested is good.

Trinity does sell the OEM Matchless transformers. See details in the Want Ads.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Would a Hammond P-T272DX (300v 125 ma) or P-T272FX (300v 150ma) work for the PT? The Lightning schematic shows 285v coming off of the PT. Since I have a couple of 5Y3 rectifiers laying around, I was thinking of using that instead of a 5AR4.

Yes, a bit high, so a 5Y3 would bring the voltage down, but it may sound a bit spongy.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Thanks for the advice. It looks like I would be better off using a 5AR4 in order to keep this amp sounding like an original Lightining 15. I do have one more question. I am having trouble finding a 120 ohm/15W resistor as shown on the layout so would a 120/10W resistor be OK?

Dan

Yes, no problem.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

I happen to have a Hammond 125E laying around and was thinking of using it for the OT. I was looking at several posts on the 18watt site and the general opinion was that the 125E would work without losing any appreciable sound quality. Has anyone tried a 125E on a Lightning? I am trying to save some $ and I could replace the OT in the future if necessary. Also, would I have to drop the voltage on the 272DX PT (300-0-300) if I use the 5AR4 rectifier? Would a 5U4G be a better choice?

Thanks,

Dan

Transformers play a crucial role in shaping the tone and performance cut the rope of your amplifier, and there can be significant differences between different transformer brands and models. While the S2 and Heyboer transformers are known for their quality and compatibility with Lightning 15 builds, Hammond transformers are also a reputable brand with many options to choose from.

We tested Hammond transformers in the past and found their sonic quality to be lacking. You can use an 8K PP OT and get the amp to work, but be prepared to put in a better OT in order to get the best quality sound.

As far as PT goes, you need to drop that AC/DC voltage. 290-0-290 is the max recommended with that circuit and the EL84s are already at max. You can use a less efficient Rect tube but I think only the 5Y3 would drop enough. Keep in mind, the rectifier current maybe up to 3A.
You can use our VRM to drop the DC, or a simple Zener Voltage Dumper from CT to ground to do the same within reason (i.e. no more than 25V drop). viewtopic.php?f=12&t=3218

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

I was contemplating of utilizing a Hammond 125E that I have lying around for the OT. Several comments I read on the 18watt website indicated that the 125E would function without significantly degrading the audio experience. Has the 125E been tried in a Lightning? I'm trying to cut costs, and if it comes to it, I can always get a new OT. Also, if I use the 5AR4 rectifier, would I need to reduce the voltage on the 272DX PT (300-0-300)? Is a 5U4G a more suitable alternative? wordle today

For the OT, I was considering utilizing a Hammond 125E that I have lying around. Several comments on the 18watt website suggested that the 125E would function without substantially degrading the audio quality. Has the 125E engine been utilized in a Lightning? I am attempting to reduce expenses, and if necessary, I can always hire a new OT. Also, would I need to reduce the voltage on the 272DX PT (300-0-300) if I use the 5AR4 rectifier? Is a 5U4G a more appropriate substitute?
gorilla tag

if I use the 5AR4 rectifier, would I need to reduce the voltage on the 272DX PT doodle jump

Hey Dan! While Hammond transformers are solid choices, S2 or Heybour could offer nuances for a truly bespoke sound. Considering the dynamic range and tonal flexibility needed, especially for a Vox-inspired amp like the Lightning 15, exploring S2 or Heybour transformers might elevate your SASSA to new heights. Experimentation often leads to the most satisfying results! Cheers.

The decision depends on your budget and priorities. If you're on a budget and prioritize that's not my neighbor ease of build, Hammond seems like a solid option.

The Lightning 15 is a great choice for that Vox vibe! The Hammond transformers are solid, but S2, SASSA Status Check and Heybour can give you a bit more of that classic sound. Your Hammond power transformer should work well, and using a Vox output transformer sounds good too! It really depends on your budget and sound preference. You might want to try both if you can!