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Old 1st December 2014, 09:29 PM   #1
cancon is offline cancon  Canada
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Default Fender reverb stand-alone

I've always been into the idea of building a reverb amp, a spring effects unit as a thru effect head...

http://www.thevintagesound.com/ffg/s...6g15_schem.gif

Looking at the original Fender Reverb 6G15 I have two questions...

Why is there no output transformer in this design? I know its not a power amp, but even tube preamps have output transformers...How does this affect the user safety and sound v.s. a unit with an OT?
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Old 1st December 2014, 09:43 PM   #2
JMFahey is offline JMFahey  Argentina
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Quote:
even tube preamps have output transformers
Who says so?
In fact, it's un common for them to do so.
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Old 1st December 2014, 10:43 PM   #3
cancon is offline cancon  Canada
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Sorry, didn't mean across the board. I've typically worked on tube pre's with balanced outputs, so I think that's where I got the idea from.
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Old 2nd December 2014, 12:08 AM   #4
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Old 2nd December 2014, 02:20 PM   #5
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by cancon View Post
Sorry, didn't mean across the board. I've typically worked on tube pre's with balanced outputs, so I think that's where I got the idea from.
Ok.

You don't say which type tube pres

An old (think 40's / 50's tube mic preamp used for broadcasting) would have had transformer balanced output because otherwise all highs would die after a few yards of cable but later were avoided if possible because real good ones are real expensive, so today it's very unusual.

Maybe you worked with vintage stuff or modern one, but built to appeal to the retro-craze market, "just like in the old days".

That stand alone Fender reverb is 50's technology, but it was meant to be mounted on top of the amp or, say, on a chair a couple feet away, and that did not justify adding an expensive (and hum prone) output transformer.

Which by the way would have needed another one at the amp input
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Old 3rd December 2014, 01:35 AM   #6
cancon is offline cancon  Canada
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Why an input transformer to accept the output?
How do effects such as the Garnet Herzog get away with this - single ended output transformer with a loaded secondary which feeds the input stage of another guitar amp.
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Old 3rd December 2014, 06:32 AM   #7
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by cancon View Post
Why an input transformer to accept the output?
How do effects such as the Garnet Herzog get away with this - single ended output transformer with a loaded secondary which feeds the input stage of another guitar amp.
You generalize and speak inplural as if they were the norm or at least there were many in constant use.

Thuth is that it's only one, which was used in just one famous song .... many years ago (American Woman) .

And what you are talking about is not "a pedal" , even less "a preamp" , but a small head, a Champ style amplifier to be more precise,

Click the image to open in full size.

with the speaker replaced by a resistor and some of that output used to overdrive another tube amplifier.



Fine, may work well, but can't be considered "the norm" , even less worry that all other preamps and tube pedals are not built like it.
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Old 5th December 2014, 01:02 AM   #8
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Sometimes you get hum form a ground loop when an external reverb unit is connected to an amp. An output transformer with floating output will break that loop.
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