I have had to laugh...
 

Having *fixed* the 'high end' 300B SET monos:

http://www.apah69.dsl.pipex.com/show/BothAmps.JPG

http://www.apah69.dsl.pipex.com/show/Together.JPG


....earlier today, I have had a very good opportunity to compare them
with my POS Chinese 300B SET stereo amp:

http://www.apah69.dsl.pipex.com/myhifi/Bez%20T3B-3.JPG


....and I'm sorry to say the Chinky knocks the crap out of them!! (More
if anyone is interested...)

But that's not important....

What is important is that they are (and, I suspect, always have been)
*out of phase* with each other!! And no, before you ask, there's no way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

:-)

If their new owner disagrees with me I will post a retraction (or say
so) here, but I'm *pretty certain* - which is a seriously big shame if
it means my little friend who bought the amps originally never heard
them in phase...??

I have had to laugh...
 

Keith G wrote:
Having *fixed* the 'high end' 300B SET monos:

http://www.apah69.dsl.pipex.com/show/BothAmps.JPG

http://www.apah69.dsl.pipex.com/show/Together.JPG


...earlier today, I have had a very good opportunity to compare them
with my POS Chinese 300B SET stereo amp:

http://www.apah69.dsl.pipex.com/myhifi/Bez%20T3B-3.JPG


...and I'm sorry to say the Chinky knocks the crap out of them!! (More
if anyone is interested...)

But that's not important....

What is important is that they are (and, I suspect, always have been)
*out of phase* with each other!! And no, before you ask, there's no way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

:-)

If their new owner disagrees with me I will post a retraction (or say
so) here, but I'm *pretty certain* - which is a seriously big shame if
it means my little friend who bought the amps originally never heard
them in phase...??



One of the many benefits of overall negative feedback in a valve amp is
that it ensures you get the output transformer phased right. With no
overall NF on these amps, they will work equally well either way round.
There's no excuse for sloppy manufacture, but at least with NF, it would
never have left the factory like that. (assuming of course that they
were tested at all)

S.

--
http://audiopages.googlepages.com

I have had to laugh...
 

"Serge Auckland" wrote

One of the many benefits of overall negative feedback in a valve amp
is that it ensures you get the output transformer phased right. With
no overall NF on these amps, they will work equally well either way
round. There's no excuse for sloppy manufacture, but at least with NF,
it would never have left the factory like that. (assuming of course
that they were tested at all)


OK Serge, where is this going to have happened then?

I'm certain I haven't buggered up the coax signal wires but I'm equally
certain they amps are out of phase, is it likely to be the transformers?
Doesn't help the amps are handed but the speaker connectors are colour
coded red/black/red, so it's not a question of how they are hooked up!

I have had to laugh...
 

Keith G wrote:
Having *fixed* the 'high end' 300B SET monos:
If their new owner disagrees with me I will post a retraction (or say
so) here, but I'm *pretty certain* - which is a seriously big shame if
it means my little friend who bought the amps originally never heard
them in phase...??

Like the look of the 300B set monos what are they ?

I have had to laugh...
 

In article ,
Keith G wrote:
What is important is that they are (and, I suspect, always have been)
*out of phase* with each other!! And no, before you ask, there's no way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

Since valves are basically unbalanced devices, the problem must be in the
output transformer?

--
*Even a blind pig stumbles across an acorn now and again *

Dave Plowman London SW
To e-mail, change noise into sound.

I have had to laugh...
 

"Dave xxxx" wrote in message
.uk...
Keith G wrote:
Having *fixed* the 'high end' 300B SET monos:
If their new owner disagrees with me I will post a retraction (or
say
so) here, but I'm *pretty certain* - which is a seriously big shame
if
it means my little friend who bought the amps originally never heard
them in phase...??

Like the look of the 300B set monos what are they ?



Professionally-built Audio Note 'Quest' clones.

I have had to laugh...
 

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:
What is important is that they are (and, I suspect, always have been)
*out of phase* with each other!! And no, before you ask, there's no
way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

Since valves are basically unbalanced devices, the problem must be in
the
output transformer?


I had no suspicion when I had them open (I had never heard them) or I
would have had a good look round - the amps are handed, but I suspect
summat's *not*...??

I have had to laugh...
 

Keith G wrote:
"Dave Plowman (News)" wrote in message
...

In article ,
Keith G wrote:

What is important is that they are (and, I suspect, always have been)
*out of phase* with each other!! And no, before you ask, there's no
way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

Since valves are basically unbalanced devices, the problem must be in
the
output transformer?



I had no suspicion when I had them open (I had never heard them) or I
would have had a good look round - the amps are handed, but I suspect
summat's *not*...??



Just compare the primary and secondary connections from the B+ and 300b
anode, and the speaker connections.

--
Nick

I have had to laugh...
 

On Fri, 11 May 2007 19:01:47 +0100, "Keith G"
wrote:


"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:
What is important is that they are (and, I suspect, always have been)
*out of phase* with each other!! And no, before you ask, there's no
way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

Since valves are basically unbalanced devices, the problem must be in
the
output transformer?


I had no suspicion when I had them open (I had never heard them) or I
would have had a good look round - the amps are handed, but I suspect
summat's *not*...??


Just had a thought. You have an out of phase transformer in this amp,
and another one in your Oktava mic. Put the two together and
everything is well again.

Just a thought.

d
--
Pearce Consulting
http://www.pearce.uk.com

I have had to laugh...
 

"Don Pearce" wrote in message
...
On Fri, 11 May 2007 19:01:47 +0100, "Keith G"
wrote:


"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:
What is important is that they are (and, I suspect, always have
been)
*out of phase* with each other!! And no, before you ask, there's no
way
I got the I/P signal wire twisted up!!

Larf? Do ewe not hafta...??

Since valves are basically unbalanced devices, the problem must be
in
the
output transformer?


I had no suspicion when I had them open (I had never heard them) or I
would have had a good look round - the amps are handed, but I suspect
summat's *not*...??


Just had a thought. You have an out of phase transformer in this amp,
and another one in your Oktava mic. Put the two together and
everything is well again.

Just a thought.



Wakey wakey, Donald - they ain't my amps! But yes, I do still have a
pair of 'out of phase' mics - just haven't thought it worth the
effort/risk of pulling them apart yet.