Collins r388 ?
 

Hey Group,
Well I dusted off a collins r388 and wow it is alot better than I thought.So
I took it to my Elmer and we found it had been messed with in the detector
department.And is motoboating.With very weak audio.Luckily we have an
original manual.But after doing some surfing I see that there are a number
of mods that have been writin' up in varios mags over the years.Most seem to
deal with making it recieve SSB..Anyway we replaced all the weak tubes and a
few filter caps but it is putting out weak sound still.So I was hoping to
get some opinions on whether to put it back as stock as possible or to go
ahead and do one of the mods that are out there.I think I'll keep this one
as it is just a great lookin and as I understand great perfoming radio.
Any suggestions?
Thanks
WesJ..........

Wes Jacson wrote:
Well I dusted off a collins r388 and wow it is alot better than I thought.So
I took it to my Elmer and we found it had been messed with in the detector
department.And is motoboating.With very weak audio.Luckily we have an
original manual.But after doing some surfing I see that there are a number
of mods that have been writin' up in varios mags over the years.Most seem to
deal with making it recieve SSB..Anyway we replaced all the weak tubes and a
few filter caps but it is putting out weak sound still.So I was hoping to
get some opinions on whether to put it back as stock as possible or to go
ahead and do one of the mods that are out there.I think I'll keep this one
as it is just a great lookin and as I understand great perfoming radio.
Any suggestions?

If you got a broken radio and you modify it, you got a modified broken
radio.

Put a signal into the antenna terminals and measure it at each point along
the IF line and see if it is within the tolerances in the manual. Check
on all bands. Then follow the demodulated signal through the audio deck.

You'll find some bad caps, maybe some bad resistors too.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

The best way to find the problem is to start at the audio output and work
back to the antenna using appropriate probes to inject signals. At some
point you'll get less signal than you should expect, the problem will be at
that stage. Use a sam photofact to help you through the stages.

Get it working properly before making any modes, if it's a keeper make the
modes, if it is an investment for future resale don't make modes.

Jim

"Wes Jacson" wrote in message
...
Hey Group,
Well I dusted off a collins r388 and wow it is alot better than I
thought.So
I took it to my Elmer and we found it had been messed with in the detector
department.And is motoboating.With very weak audio.Luckily we have an
original manual.But after doing some surfing I see that there are a number
of mods that have been writin' up in varios mags over the years.Most seem
to
deal with making it recieve SSB..Anyway we replaced all the weak tubes and
a
few filter caps but it is putting out weak sound still.So I was hoping to
get some opinions on whether to put it back as stock as possible or to go
ahead and do one of the mods that are out there.I think I'll keep this one
as it is just a great lookin and as I understand great perfoming radio.
Any suggestions?
Thanks
WesJ..........

"James M. Goldenberg" wrote in message
...
The best way to find the problem is to start at the audio output and work
back to the antenna using appropriate probes to inject signals. At some
point you'll get less signal than you should expect, the problem will be
at
that stage. Use a sam photofact to help you through the stages.

Get it working properly before making any modes, if it's a keeper make the
modes, if it is an investment for future resale don't make modes.

Jim

"Wes

Put it back original. Most "mods" can be done as add-ons that DO NOT
involve hole drilling or butchering. I'd make the mods fully reversible
if it was radio.

73

Pete