|
Gentlemen,
I am hoping someone can shed some light on my issues, the primary one being distortion and some "frying egg" noise. The distortion is more pronounced on lower notes especially with multiple notes played together. This occurs only when reverb is on. All tubes are fine as tested in another PR 40 and I replaced the RCA cable from necklace to amp. Two other minor issues, the reverb is switchable using the chorale/tremolo switch. The console is outfitted with the Trek II SS1 preamp if I remember the model correctly, the Trek folks asked me some questions then said it was a very early model, and lastly, the bass isn't as strong as on my other PR 40. Tomorrow, with assistance I will try to confirm both 15"s are working. In summary the unit plays clean with reverb off but gets ugly when the reverb is on.
Thank You one and all,
?John
|
Replace the caps with the kit from Tonewheel General Hospital.
On 2/16/2020 9:20 PM, john
alluneedtoknow via Groups.Io wrote:
toggle quoted message
Show quoted text
Gentlemen,
I am hoping someone can shed some light on my issues, the primary
one being distortion and some "frying egg" noise. The distortion
is more pronounced on lower notes especially with multiple notes
played together. This occurs only when reverb is on. All tubes are
fine as tested in another PR 40 and I replaced the RCA cable from
necklace to amp. Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is outfitted with
the Trek II SS1 preamp if I remember the model correctly, the Trek
folks asked me some questions then said it was a very early model,
and lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both 15"s are
working. In summary the unit plays clean with reverb off but gets
ugly when the reverb is on.
Thank You one and all,
?John
|
Thank you Scott,
The kit arrived and I will perform the surgery later today, and report back.
Regards,
On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn <organfreak@...> wrote:
Replace the caps with the kit from Tonewheel General Hospital.
On 2/16/2020 9:20 PM, john
alluneedtoknow via Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my issues, the primary
one being distortion and some "frying egg" noise. The distortion
is more pronounced on lower notes especially with multiple notes
played together. This occurs only when reverb is on. All tubes are
fine as tested in another PR 40 and I replaced the RCA cable from
necklace to amp. Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is outfitted with
the Trek II SS1 preamp if I remember the model correctly, the Trek
folks asked me some questions then said it was a very early model,
and lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both 15"s are
working. In summary the unit plays clean with reverb off but gets
ugly when the reverb is on.
Thank You one and all,
?John
|
"Like."
On 2/22/2020 9:09 AM, john
alluneedtoknow via Groups.Io wrote:
toggle quoted message
Show quoted text
Thank you Scott,
The kit arrived
and I will perform the surgery later today, and report back.
Regards,
?John
On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn
Replace the caps with the kit from Tonewheel General
Hospital.
On 2/16/2020
9:20 PM, john alluneedtoknow via Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my issues,
the primary one being distortion and some "frying egg"
noise. The distortion is more pronounced on lower notes
especially with multiple notes played together. This
occurs only when reverb is on. All tubes are fine as
tested in another PR 40 and I replaced the RCA cable
from necklace to amp. Two other minor issues, the reverb
is switchable using the chorale/tremolo switch. The
console is outfitted with the Trek II SS1 preamp if I
remember the model correctly, the Trek folks asked me
some questions then said it was a very early model, and
lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both
15"s are working. In summary the unit plays clean with
reverb off but gets ugly when the reverb is on.
Thank You one and all,
?John
|
I realize that you complained only of the sound when using the
Reverb, but caps last only 20-30 years normally, and this should
make your unit sound good for many years to come, unless something
else unusual is wrong. IOW, good preventive maintenance. Pay close
attention to variations in the filter cap design. If you get lost
in that respect, be sure to call Rick Prevallet.
On 2/22/2020 9:09 AM, john
alluneedtoknow via Groups.Io wrote:
toggle quoted message
Show quoted text
Thank you Scott,
The kit arrived
and I will perform the surgery later today, and report back.
Regards,
?John
On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn
Replace the caps with the kit from Tonewheel General
Hospital.
On 2/16/2020
9:20 PM, john alluneedtoknow via Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my issues,
the primary one being distortion and some "frying egg"
noise. The distortion is more pronounced on lower notes
especially with multiple notes played together. This
occurs only when reverb is on. All tubes are fine as
tested in another PR 40 and I replaced the RCA cable
from necklace to amp. Two other minor issues, the reverb
is switchable using the chorale/tremolo switch. The
console is outfitted with the Trek II SS1 preamp if I
remember the model correctly, the Trek folks asked me
some questions then said it was a very early model, and
lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both
15"s are working. In summary the unit plays clean with
reverb off but gets ugly when the reverb is on.
Thank You one and all,
?John
|
I was born on Friday the 13th. The amp cleaned up and quieted down nicely with the new caps and the bass was more full and round, but it was still noisy with reverb on so I probed further. I ended up replacing some plate load resistors and did much head scratching. I isolated the reverb transformer and its secondaries, then measured each to the center tap, brown/209 ohms and blue/279 ohms, so I swapped in a better unit measuring 229/245 ohms. These two actions cured the issue. I played it for 5 days with no problems,until tonite when I reinstalled it,sounded wonderful, then POP......! Reverb now MIA,except for some noise,and the return works when touching the springs, but with reverb off still good,nice and quiet. Should I give up or purchase a large hammer?
On Sat, Feb 22, 2020 at 12:09, j f <keysnleslie122@...> wrote: Thank you Scott,
The kit arrived and I will perform the surgery later today, and report back.
Regards, ?John On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn <organfreak@...> wrote:
Replace the caps with the kit from Tonewheel General Hospital.
On 2/16/2020 9:20 PM, john
alluneedtoknow via Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my issues, the primary
one being distortion and some "frying egg" noise. The distortion
is more pronounced on lower notes especially with multiple notes
played together. This occurs only when reverb is on. All tubes are
fine as tested in another PR 40 and I replaced the RCA cable from
necklace to amp. Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is outfitted with
the Trek II SS1 preamp if I remember the model correctly, the Trek
folks asked me some questions then said it was a very early model,
and lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both 15"s are
working. In summary the unit plays clean with reverb off but gets
ugly when the reverb is on.
Thank You one and all,
?John
|
Or maybe a better soldering iron?
On 3/2/2020 9:18 PM, john
alluneedtoknow via Groups.Io wrote:
toggle quoted message
Show quoted text
I was born on Friday the 13th. The amp cleaned up and quieted down
nicely with the new caps and the bass was more full and round, but
it was still noisy with reverb on so I probed further. I ended up
replacing some plate load resistors and did much head scratching.
I isolated the reverb transformer and its secondaries, then
measured each to the center tap, brown/209 ohms and blue/279 ohms,
so I swapped in a better unit measuring 229/245 ohms. These two
actions cured the issue. I played it for 5 days with no
problems,until tonite when I reinstalled it,sounded wonderful,
then POP......! Reverb now MIA,except for some noise,and the
return works when touching the springs, but with reverb off still
good,nice and quiet. Should I give up or purchase a large hammer?
On Sat, Feb 22, 2020 at 12:09, j f
Thank you Scott,
The kit
arrived and I will perform the surgery later today, and
report back.
Regards,
?John
On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn
Replace the caps with the kit from Tonewheel
General Hospital.
On
2/16/2020 9:20 PM, john alluneedtoknow via
Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my
issues, the primary one being distortion and some
"frying egg" noise. The distortion is more
pronounced on lower notes especially with multiple
notes played together. This occurs only when reverb
is on. All tubes are fine as tested in another PR 40
and I replaced the RCA cable from necklace to amp.
Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is
outfitted with the Trek II SS1 preamp if I remember
the model correctly, the Trek folks asked me some
questions then said it was a very early model, and
lastly, the bass isn't as strong as on my other PR
40. Tomorrow, with assistance I will try to confirm
both 15"s are working. In summary the unit plays
clean with reverb off but gets ugly when the reverb
is on.
Thank You one and all,
?John
|
I did not follow this. thread in full but since I’m being at revising some PR40s at the moment, I found that one cause for noisy or weak reverb can be the transistor 2N306? in the receiver circuit of the spring reverb (AO-33-1). The 100uF emitter capacitor often is anoter culprit. I dropped in some standard silicon NPN transistor with an hfe (current gain) of 100-300 and it made reverb come back.?
BTW, it is totally normal that the Ohm values of the primary windings differ. Important is the winding ratio. And this is a constant. The difference in the ?ohmage“ is that the windings are stacked one upon the other with the circumference changing resultig in different wire lenghts for either winding.
So changing the OT is a shot in the dark.
— Christoph
toggle quoted message
Show quoted text
Or maybe a better soldering iron?
On 3/2/2020 9:18 PM, john
alluneedtoknow via Groups.Io wrote:
I was born on Friday the 13th. The amp cleaned up and quieted down
nicely with the new caps and the bass was more full and round, but
it was still noisy with reverb on so I probed further. I ended up
replacing some plate load resistors and did much head scratching.
I isolated the reverb transformer and its secondaries, then
measured each to the center tap, brown/209 ohms and blue/279 ohms,
so I swapped in a better unit measuring 229/245 ohms. These two
actions cured the issue. I played it for 5 days with no
problems,until tonite when I reinstalled it,sounded wonderful,
then POP......! Reverb now MIA,except for some noise,and the
return works when touching the springs, but with reverb off still
good,nice and quiet. Should I give up or purchase a large hammer?
On Sat, Feb 22, 2020 at 12:09, j f
Thank you Scott,
The kit
arrived and I will perform the surgery later today, and
report back.
Regards,
?John
On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn
Replace the caps with the kit from Tonewheel
General Hospital.
On
2/16/2020 9:20 PM, john alluneedtoknow via
Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my
issues, the primary one being distortion and some
"frying egg" noise. The distortion is more
pronounced on lower notes especially with multiple
notes played together. This occurs only when reverb
is on. All tubes are fine as tested in another PR 40
and I replaced the RCA cable from necklace to amp.
Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is
outfitted with the Trek II SS1 preamp if I remember
the model correctly, the Trek folks asked me some
questions then said it was a very early model, and
lastly, the bass isn't as strong as on my other PR
40. Tomorrow, with assistance I will try to confirm
both 15"s are working. In summary the unit plays
clean with reverb off but gets ugly when the reverb
is on.
Thank You one and all,
?John
|
Keep going John in all peace. Friday the 13th is the special lucky day here in France. So enjoy it!
Once in a while I pray to God about our Hammond... And God is good... Better than Friday the 13th.
Blessings?
Ali
On Tue, 3 Mar 2020, 06:18 john alluneedtoknow via Groups.Io, <keysnleslie122= [email protected]> wrote: I was born on Friday the 13th. The amp cleaned up and quieted down nicely with the new caps and the bass was more full and round, but it was still noisy with reverb on so I probed further. I ended up replacing some plate load resistors and did much head scratching. I isolated the reverb transformer and its secondaries, then measured each to the center tap, brown/209 ohms and blue/279 ohms, so I swapped in a better unit measuring 229/245 ohms. These two actions cured the issue. I played it for 5 days with no problems,until tonite when I reinstalled it,sounded wonderful, then POP......! Reverb now MIA,except for some noise,and the return works when touching the springs, but with reverb off still good,nice and quiet. Should I give up or purchase a large hammer?
On Sat, Feb 22, 2020 at 12:09, j f Thank you Scott,
The kit arrived and I will perform the surgery later today, and report back.
Regards, ?John On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn
Replace the caps with the kit from Tonewheel General Hospital.
On 2/16/2020 9:20 PM, john
alluneedtoknow via Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my issues, the primary
one being distortion and some "frying egg" noise. The distortion
is more pronounced on lower notes especially with multiple notes
played together. This occurs only when reverb is on. All tubes are
fine as tested in another PR 40 and I replaced the RCA cable from
necklace to amp. Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is outfitted with
the Trek II SS1 preamp if I remember the model correctly, the Trek
folks asked me some questions then said it was a very early model,
and lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both 15"s are
working. In summary the unit plays clean with reverb off but gets
ugly when the reverb is on.
Thank You one and all,
?John
|
Thank you one and all for the help and words of encouragement,it all helps. I was drawing from my guitar amp knowledge when I changed the transformer because if it were an output trans that far out of balance it would sound terrible,or worse. Is there an "off the shelf" transistor I can use? Other than using a heat sink when installing them I know very little and usually run scared. As for a better soldering iron Scott, I've gotten comfortable with my woodburning pencil with the rusty nail for a tip so i dont want to change and learn all over again,but good advice nonetheless.
Best Regards,
On Wed, Mar 4, 2020 at 11:12, Ali Asreco <aliasreco@...> wrote: Keep going John in all peace. Friday the 13th is the special lucky day here in France. So enjoy it!
Once in a while I pray to God about our Hammond... And God is good... Better than Friday the 13th.
Blessings?
Ali On Tue, 3 Mar 2020, 06:18 john alluneedtoknow via Groups.Io, <keysnleslie122= [email protected]> wrote: I was born on Friday the 13th. The amp cleaned up and quieted down nicely with the new caps and the bass was more full and round, but it was still noisy with reverb on so I probed further. I ended up replacing some plate load resistors and did much head scratching. I isolated the reverb transformer and its secondaries, then measured each to the center tap, brown/209 ohms and blue/279 ohms, so I swapped in a better unit measuring 229/245 ohms. These two actions cured the issue. I played it for 5 days with no problems,until tonite when I reinstalled it,sounded wonderful, then POP......! Reverb now MIA,except for some noise,and the return works when touching the springs, but with reverb off still good,nice and quiet. Should I give up or purchase a large hammer?
On Sat, Feb 22, 2020 at 12:09, j f Thank you Scott,
The kit arrived and I will perform the surgery later today, and report back.
Regards, ?John On Mon, Feb 17, 2020 at 0:30, Scott Hawthorn
Replace the caps with the kit from Tonewheel General Hospital.
On 2/16/2020 9:20 PM, john
alluneedtoknow via Groups.Io wrote:
Gentlemen,
I am hoping someone can shed some light on my issues, the primary
one being distortion and some "frying egg" noise. The distortion
is more pronounced on lower notes especially with multiple notes
played together. This occurs only when reverb is on. All tubes are
fine as tested in another PR 40 and I replaced the RCA cable from
necklace to amp. Two other minor issues, the reverb is switchable
using the chorale/tremolo switch. The console is outfitted with
the Trek II SS1 preamp if I remember the model correctly, the Trek
folks asked me some questions then said it was a very early model,
and lastly, the bass isn't as strong as on my other PR 40.
Tomorrow, with assistance I will try to confirm both 15"s are
working. In summary the unit plays clean with reverb off but gets
ugly when the reverb is on.
Thank You one and all,
?John
|
Christoph