trinityamps.com

Trinity Amps Guitar Amp Forum
It is currently Thu Jun 08, 2023 12:39 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: Lightning Transformers
PostPosted: Wed Apr 19, 2006 10:47 pm 
Offline
Friend
Friend

Joined: Mon Apr 10, 2006 12:57 pm
Posts: 23
Location: Phoenix, AZ
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


Top
 Profile  
 
 Post subject:
PostPosted: Thu Apr 20, 2006 6:59 am 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7518
Location: Canada
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.

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


Top
 Profile  
 
 Post subject:
PostPosted: Thu Apr 20, 2006 4:56 pm 
Offline
Friend
Friend

Joined: Mon Apr 10, 2006 12:57 pm
Posts: 23
Location: Phoenix, AZ
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.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Apr 20, 2006 11:17 pm 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7518
Location: Canada
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


Top
 Profile  
 
 Post subject:
PostPosted: Fri Apr 21, 2006 3:12 pm 
Offline
Friend
Friend

Joined: Mon Apr 10, 2006 12:57 pm
Posts: 23
Location: Phoenix, AZ
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


Top
 Profile  
 
 Post subject:
PostPosted: Fri Apr 21, 2006 7:38 pm 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7518
Location: Canada
dpm309 wrote:
would a 120/10W resistor be OK?Dan


Yes, no problem.

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


Top
 Profile  
 
 Post subject:
PostPosted: Wed Apr 26, 2006 12:02 pm 
Offline
Friend
Friend

Joined: Mon Apr 10, 2006 12:57 pm
Posts: 23
Location: Phoenix, AZ
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


Top
 Profile  
 
PostPosted: Mon May 08, 2023 5:34 am 
Offline

Joined: Mon May 08, 2023 5:23 am
Posts: 2
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.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue May 09, 2023 3:12 pm 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7518
Location: Canada
dpm309 wrote:
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?


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


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 9 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group