|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
63.246.183.22
In Reply to: RE: Basler Output Transformer posted by Michael Samra on July 16, 2016 at 23:27:20
I have no idea what that transformer was for, but you lucked out. Maybe it was for bass guitar? I've tested a number of guitar-type transformers, and what you're describing is not typical.
--------------------------
Buy Chinese. Bury freedom.
Follow Ups:
I was mistaken,it was a Peavey and it was a 40 watt trafo and I was running a pair of KT66s and it at about 25 watts and it made some good numbers but you had to play with FB.I know what you are saying tho because guitar transformers typically don't have any bandwidth to speak of.
Now,there are some nice audio amps that Peavey makes that does have some nice iron and they sound absolutely incredible once you upgrade and mod them a bit.The 120/120 classic,is one that is very impressive.There are others that have heard this amp and will agree.I've rebuilt and upgraded three of these and they make 105wpc at full bandwidth.You can make 120 if you run KT88s and the power trafos handle them just fine.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Michael, that's quite a coincidence. I really love the old Peavey iron for building guitar amps. In fact, I have an amp project on the back burner right now using the OPT from a Peavey Classic 30. It was a six-month search to find the transformer because I wanted to use a pair of EL34s at this power level. The Peavey used four 6BQ5s in PPP, so it's a good match at 3.8K ohms plate-to-plate. This isn't hi-fi response, but the prototype amp does 40W over the range of a six-string. That's a testament to the how well the Peavey iron was built back in the day. Below are some of my notes from the power amp prototype. I'll add preamp and tone control circuitry when I restart the project, hopefully later this year.
--------------------------
Buy Chinese. Bury freedom.
Now we are on the same page..The classic 120 and the classic are very acceptable hifi quality and with the circuit you drew and implemented for the 120,that amp becomes a real marvel..I used 6CG7s and a 12AY7 on the input and that worked well.
While you will not get the bandwidth of a Citation,Mac,or Peerless trafo,it's one I could live with on a daily basis if I didn't have the others.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Have you tried any of the Hammond organ transformers? I don't mean the little wimpy things from 6V6 models. I have a set right now that were used with a pair of 7591s running at +450V. I haven't built anything with them yet, not even a prototype, but I suspect they'll do 20Hz at reasonable power levels. They came out of a full-size organ, so the lowest pedal note was 32Hz. Also, they only have a single output winding, but it's 8 ohms, so they're compatible with 99.9% of modern speaker systems. I'm looking forward to trying them, but haven't heard much from other people who have used this type of iron.
--------------------------
Buy Chinese. Bury freedom.
Jack
The only Hammond Trafo I used and it sounds quite good,is a PA-1650R.
I have them in an MFA75 amp and they are decent.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Hammond organs aren't related to the Hammond transformer company in Canada. I don't know who made the organ transformers, probably one of the US manufacturers like Chicago, Triad, etc.
--------------------------
Buy Chinese. Bury freedom.
called the Mesa Baron?
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/17/16
Being a guitar player I remember seeing these when they were out. For some reason I also remember being told that they didn't sound great but that could have been someone's taste at play.
Danny
The person that may have said it didn't sound great,was probably some guy that calls himself an audiophile,you know the kind that reads the hifi magazines and goes out and buys audio gear on his credit card,soley based on what some reviewer writes? There is no way possible this amp can sound good because it made by a company that makes guitar amps..I will tell,some of the logic I have heard thru the years from those people give us enough lines to write a five hour sitcom.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
...and wasn't suited to most speakers in use at he time. One major logical flaw was to design the output stage such that the output impedance was equal to the load impedance...not the more typical simulation of a low impedance voltage source that many speaker mfgrs assume. Another problem was too much "choice"....32 combinations of feedback level and output stage configuration.See link for the bipolar Stereophile review and try and read the whole thing (if you dare).
Edits: 07/18/16
Steve
I actually heard the amp on a pair of Magnepan 20.1s and it was quite good at the time..We were using the 8db setting but being the Maggies are an easy resistive load to drive,maybe it wasn't the most accurate test. The amp did have potential because the iron was quite good. If I heard it on ESLs,maybe it wouldn't like that impedance swing.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/18/16
!
The Mind has No Firewall~ U.S. Army War College.
Aren't they tho Kenny? Those horrible 6L6s and they are still making those rotten things..Then they have the nerve to make other disgusting offspring such as the KT66,EL37,7581,5881,and 7027s. Shame on them..LOL
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: