Info on SWR amp required

R

Ron(UK)

Guest
Hi chums

Does anyone have, or can point me to towards a circuit diagram
(Schematic) for an SWR Baby Blue bass amp.

At this point all I need to know is the value of the Master Volume pot.

Cheers
Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com
 
Arfa Daily wrote:
"Ron(UK)" <ron@lunevalleyaudio.com> wrote in message
news:Zv2dnZ9on4jogAbVnZ2dnUVZ8vCdnZ2d@bt.com...
Hi chums

Does anyone have, or can point me to towards a circuit diagram (Schematic)
for an SWR Baby Blue bass amp.

At this point all I need to know is the value of the Master Volume pot.

Cheers
Ron(UK)

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com

There's some SWR schematics on here
http://www.schematicheaven.com/post70s.htm Ron, and also on here
http://www.freeinfosociety.com/electronics/schempage.php?cat=1 but they are
by model number rather than name. Might be similar if not the same.

Arfa


Cheers for that Arfa, I`d already looked there but Baby Blue and
Click to expand...
Electric Blue seem to be the only model 'numbers', the two amps share
the same amp, one being a combo the other just a head.

Ron

--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com
 
N Cook wrote:
Ron(UK) <ron@lunevalleyaudio.com> wrote in message
news:Zv2dnZ9on4jogAbVnZ2dnUVZ8vCdnZ2d@bt.com...
Hi chums

Does anyone have, or can point me to towards a circuit diagram
(Schematic) for an SWR Baby Blue bass amp.

At this point all I need to know is the value of the Master Volume pot.

Cheers
Ron(UK)


Assuming someone has totally removed it and lost it so nothing to measure, I
don't see what harm you can do by trying 10K,50K or 100K log or lin. Its not
as though you will put in a 50 ohm one. Then just optimisation.
Click to expand...
The master vol pot had been changed by a local shop, after which the amp
lost it`s 'sweet spot' I suspect the wrong value was fitted. I could
fiddle about trying various pots and giving the amp back to the customer
each time he has a gig to try out, but it`s far easier to fit the
correct value and do the job right.


SWR - anything to do with Simms Watts ?
Click to expand...
Unlikely, SWR are an American company, the venerable Simms-Watts were
British. I used to be a Simms Watts dealer, sadly they never really made
the leap from making (excellent) valve amps to solid state.


Ron(UK)
 
On Thu, 07 Aug 2008 17:06:07 +0100, "Ron(UK)"
<ron@lunevalleyaudio.com> put finger to keyboard and composed:

Hi chums

Does anyone have, or can point me to towards a circuit diagram
(Schematic) for an SWR Baby Blue bass amp.

At this point all I need to know is the value of the Master Volume pot.

Cheers
Ron(UK)
Click to expand...
Sometimes the Wayback Machine can dig up stuff that is no longer on
the Web. Unfortunately, this time it turned up nothing useful. :-(

Anyway for old times' sake ...
http://web.archive.org/web/19970630125937/www.swreng.com/vintage.html

Here's a pic of Baby Blue 1:
http://web.archive.org/web/19970630131801/www.swreng.com/art/vintage/babyblue1.jpeg

.... and Electric Blue:
http://web.archive.org/web/19970630131801/www.swreng.com/art/vintage/babyblue1.jpeg

I notice Arfa's links point to two schematics that both use a 50K
master volume pot on the output of an op-amp. The wiper drives a
second op-amp configured as an inverting unity gain amp with 10K
resistors in the input and feedback paths. If your amp uses the same
design philosophy, then I think 50K would be a good bet.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On Thu, 07 Aug 2008 17:06:07 +0100, "Ron(UK)"
<ron@lunevalleyaudio.com> put finger to keyboard and composed:

Does anyone have, or can point me to towards a circuit diagram
(Schematic) for an SWR Baby Blue bass amp.
Click to expand...
http://www.swrsound.com/support/faq.php#service

Q: How can I order a schematic?

A: To request a schematic, please provide your full name and mailing
address (or fax number), along with the model and serial number of
your amplifier. Send your request to "swrcustserve at fender dot com",
or contact the FMIC Consumer Relations Department, 480-596-7195.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
Franc Zabkar wrote:
On Thu, 07 Aug 2008 17:06:07 +0100, "Ron(UK)"
ron@lunevalleyaudio.com> put finger to keyboard and composed:

Hi chums

Does anyone have, or can point me to towards a circuit diagram
(Schematic) for an SWR Baby Blue bass amp.

At this point all I need to know is the value of the Master Volume pot.

Cheers
Ron(UK)

Sometimes the Wayback Machine can dig up stuff that is no longer on
the Web. Unfortunately, this time it turned up nothing useful. :-(

Anyway for old times' sake ...
http://web.archive.org/web/19970630125937/www.swreng.com/vintage.html

Here's a pic of Baby Blue 1:
http://web.archive.org/web/19970630131801/www.swreng.com/art/vintage/babyblue1.jpeg

... and Electric Blue:
http://web.archive.org/web/19970630131801/www.swreng.com/art/vintage/babyblue1.jpeg

I notice Arfa's links point to two schematics that both use a 50K
master volume pot on the output of an op-amp. The wiper drives a
second op-amp configured as an inverting unity gain amp with 10K
resistors in the input and feedback paths. If your amp uses the same
design philosophy, then I think 50K would be a good bet.

- Franc Zabkar
Click to expand...
Cheers for that
Ron(UK)
 
On Sun, 10 Aug 2008 01:51:04 +0100, "Arfa Daily"
<arfa.daily@ntlworld.com> put finger to keyboard and composed:

"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:93dq9493gu60m8u2394782mlt2gl6gk52a@4ax.com...
On Thu, 07 Aug 2008 17:06:07 +0100, "Ron(UK)"
ron@lunevalleyaudio.com> put finger to keyboard and composed:

Does anyone have, or can point me to towards a circuit diagram
(Schematic) for an SWR Baby Blue bass amp.

http://www.swrsound.com/support/faq.php#service

Q: How can I order a schematic?

A: To request a schematic, please provide your full name and mailing
address (or fax number), along with the model and serial number of
your amplifier. Send your request to "swrcustserve at fender dot com",
or contact the FMIC Consumer Relations Department, 480-596-7195.

- Franc Zabkar

Aha! So does this imply that they were always / are now part of Fender ?

Arfa
Click to expand...
I don't know, but Steve W. Rabe went on to found Raven Labs from which
he retired in Feb 2005:

http://www.raven-labs.com/welcome.html

The web site says ...

===================================================================
If you are the owner of a Raven Labs product and require service or
repair, please contact:

* MR Electronics
6559 Coldwater Canyon Ave.
North Hollywood, CA 91606
Phone: (818) 259-1939
Attn: Mario Rebollero
Email: mariorebollero at yahoo dot com
===================================================================

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top