rdjones , VinatgeCharlie,
Thanks for the links to those multi-tap OTs based on the original RS model.
Best, tony
Most versatile "platform" to try out circuits
Moderators: pompeiisneaks, Colossal
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VintageCharlie
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Re: Most versatile "platform" to try out circuits
Btw., seeing you reside in Frankfurt, you might know the german company Welter. They offer lots of trannies too and they have a version of the RS ot too (or something along these lines - don;t know how close it comes to the originals). It has the 6.6k and 8k taps: http://www.welter-electronic.de/bauteil ... trager.htm
Look for Ü-JTM 45 .
Look for Ü-JTM 45 .
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VintageCharlie
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Re: Most versatile "platform" to try out circuits
I took a look at the various multi-tap PT's that you guys steered me to and at the PT's of the amp models i'd be interested in "exploring". One way would be to go for a multiple tap PT with a "middle of the ground" mA rating - ~200. But this would be quite far from most of the models in question. Hence, i had to realize that i have to get several PT's. Lots of more spendings, but at least i'd have the various designs available simultaneously and i could explore various hybrids between the circuits.
The models i'm after (all of them are 30-50wattish designs):
- early 50w Marshalls
- AC30, Rocket and the plethora of the bouteek derivates of these - like almost the entire Xits line, Matchless, etc.
- Super reverb - the saturated, rich, but smooth texas type thing. I suppose that the 50w Dumble types are built around similar trannies? So that would give me the possibility to explore those kind of things too.
For Marshalls the 350/325v@150mA PT from Ingo is perfect - it would cover all 2x KT66 and 2xel34 models i'm interested in.
For the AC30 and Rocket type thing, from what i could gather, the same PT would do fine - ac30 seems to be rated for 270mA, Rocket and by the looks of it, half of the bouteek offering seems to have 300mA'ish rating. I suppose the 30mA difference would be neglectable?
Is there any PT out there that would be suitable for both of these desings and, if yes, which model would be my best bet for a build that might go in either direction?
I have no idea if and how the 5v and 6.3v mA rating affects the performance and/or tone of the circuit, as long as they are sufficient for the purpose. I mean, would the higher mA of the 5 and 6.3v taps of the Trainwreck PT change the performance/tone in case it would be utilized in an AC30 circuit? If the ac30 would sound just like an ac30 with a Trainwreck style PT, then that would be the one to get, right?
And the third on the list would be either a Super Reverb style PT or the Multi-tap PT from Triode, as it covers the SR specs almost identically (+ it offers additional voltages), except for the 5v tap, which is rated at 1.9A, but the SR's PT (at least from classic tone) is specced at 3A. Would it be a problem if i'd have 1A less on the 5v tap in case i'd build an SR?
Sorry for the many questions and the obvious ignorance - i'm just starting out with all this and hope to learn as much as possible.
The models i'm after (all of them are 30-50wattish designs):
- early 50w Marshalls
- AC30, Rocket and the plethora of the bouteek derivates of these - like almost the entire Xits line, Matchless, etc.
- Super reverb - the saturated, rich, but smooth texas type thing. I suppose that the 50w Dumble types are built around similar trannies? So that would give me the possibility to explore those kind of things too.
For Marshalls the 350/325v@150mA PT from Ingo is perfect - it would cover all 2x KT66 and 2xel34 models i'm interested in.
For the AC30 and Rocket type thing, from what i could gather, the same PT would do fine - ac30 seems to be rated for 270mA, Rocket and by the looks of it, half of the bouteek offering seems to have 300mA'ish rating. I suppose the 30mA difference would be neglectable?
Is there any PT out there that would be suitable for both of these desings and, if yes, which model would be my best bet for a build that might go in either direction?
I have no idea if and how the 5v and 6.3v mA rating affects the performance and/or tone of the circuit, as long as they are sufficient for the purpose. I mean, would the higher mA of the 5 and 6.3v taps of the Trainwreck PT change the performance/tone in case it would be utilized in an AC30 circuit? If the ac30 would sound just like an ac30 with a Trainwreck style PT, then that would be the one to get, right?
And the third on the list would be either a Super Reverb style PT or the Multi-tap PT from Triode, as it covers the SR specs almost identically (+ it offers additional voltages), except for the 5v tap, which is rated at 1.9A, but the SR's PT (at least from classic tone) is specced at 3A. Would it be a problem if i'd have 1A less on the 5v tap in case i'd build an SR?
Sorry for the many questions and the obvious ignorance - i'm just starting out with all this and hope to learn as much as possible.
Re: Most versatile "platform" to try out circuits
You'd need the 3A capability to allow the use of a 5U4 rectifier which some Fender variants use.VintageCharlie wrote:And the third on the list would be either a Super Reverb style PT or the Multi-tap PT from Triode, as it covers the SR specs almost identically (+ it offers additional voltages), except for the 5v tap, which is rated at 1.9A, but the SR's PT (at least from classic tone) is specced at 3A. Would it be a problem if i'd have 1A less on the 5v tap in case i'd build an SR?
Concerning the B+ current ratings, consider that transformers are rated at a given percent of regulation and if you're pulling less current the voltage will somewhat higher.
This and higher modern wall voltages will conspire to give higher B+ voltages than you might like.
It is nice to have extra current capacity on hand.
You seem to know enough to be asking the right questions, this is a good thing.Sorry for the many questions and the obvious ignorance - i'm just starting out with all this and hope to learn as much as possible.
rd
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VintageCharlie
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- Location: Latvia
Re: Most versatile "platform" to try out circuits
Thanks for the info!
So the 9144 from heyboer would provide the basis for voltages needed for an authentic ac30 tone as well as a Rocket? (in case the 300mA rating, that might be a bit of overkill for an ac30, might contribute to higher B+, i could use the 250v tap to compensate for this effect and the higher wall voltages we see today?) Or is there simply no way for one PT to do two things equally well and i should decide to which of the circuits i'd want to come closest?
So the 9144 from heyboer would provide the basis for voltages needed for an authentic ac30 tone as well as a Rocket? (in case the 300mA rating, that might be a bit of overkill for an ac30, might contribute to higher B+, i could use the 250v tap to compensate for this effect and the higher wall voltages we see today?) Or is there simply no way for one PT to do two things equally well and i should decide to which of the circuits i'd want to come closest?