It is currently Mon Mar 16, 2020 2:18 pm

All times are UTC - 7 hours



Post new topic Reply to topic  [ 33 posts ]  Go to page Previous  1, 2, 3  Next
Go to page Previous  1, 2, 3  Next
Author Message
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 12:11 am
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
I am taking this amp in tomorrow to check out the motorboating.

I ordered the new grill cloth:
http://www.ebay.com/itm/380178175088?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Please tell me what you think of the grill cloth for
a 1968 Fender Dual Showman Reverb TFL5000D amp head?
I had lots of choices from a variety of vendors, nothing EXACT
was available. I believe this will be close and good looking.

I ordered the Drip Edge aluminum trim rails:
http://www.ebay.com/itm/320611707217?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

I purchased four (4) hard to get drip edger corners:
http://www.ebay.com/itm/110846102066?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649



Following is a photo of the 1968 Dual Showman Reverb amp head BEFORE:Image


I will do the upgrades myself and will post Before & After photos.
This was the first amp I had purchased in years and knew nothing about
what to look for, what was missing, what was right, what was wrong, etc.
The seller kept tons of info out of the EBay listing and I was ingnorant.

Toppscore 8)

_________________
Image


Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 1:17 am
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
What are the tranny numbers for this amp?

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 3:51 am
Offline
Aspiring Musician
Aspiring Musician
User avatar

Joined: Sat Mar 31, 2012 6:38 am
Posts: 593
Dang! I wish mine looked so good. What's wrong with the grill cloth that you want to replace it. It looks great to me.

_________________
...I for one, sure would appreciate the return of intelligent conversation, spirit of assistance and the simple yet effective ignoring of those who can't seem to hang with that...
Best regards,
rob


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 6:33 am
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
Retroverbial wrote:
What are the tranny numbers for this amp? Arjay


Fender Dual Showman Reverb
AA768 TFL5000 (silverface)
A13900 to A16500 - 1968 *** A13971 this amp's serial number

The 1968 Dual Showman Reverb Amps began to ship using SN#A13900,
making mine approx the 71st of ALL Showman Reverbs ever to be shipped
since the beginning of electricity!!!


Power Transformer PN# F022756 * Serial# 606827 = 27th Week (July) of 1968
Output Transformer PN# 022889 * Serial# 606825 = 25th Week (June) of 1968
Reverb Transformer PN# 022921 * Serial# 606811 = 11th Week (March) of 1968
Choke Serial PN# 022699 * Serial# 606744 = 44th Week (November) of 1967

** I was advised that the 1968 Dual Showman Reverbs and
the 1968 Bandmaster Reverbs began shipping in June/July of 1968.

_________________
Image


Last edited by Toppscore on Fri May 18, 2012 6:46 am, edited 3 times in total.

Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 6:38 am
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
Arc-n-spark wrote:
Dang! I wish mine looked so good. What's wrong with the grill cloth that you want to replace it. It looks great to me.


The grill cloth, according to my contemporary experts,
is turned 90 degrees incorrectly.

And, you can see that two side drip edge aluminum rails are missing.
Looked good to me when dummy me was buying my first amp.
Today, I want to taken it in to review motorboarding sounds.

Toppscore 8)

_________________
Image


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 7:47 am
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Topp, motorboating is most always a coupling (or more specifically an ineffective de-coupling) issue between stages. The B+ tap points supplying voltage to the plates are not electrically isolated well enough from each other. This leads to oddball positive feedback effects and that classic putt-putt tone.

Bad caps in the PS, way out of spec PS rail resistors, poor grounding are just some of the possible problems. Wiring layout can also contribute. As well as weak tubes or poor alignment of components on the board. Whole amp should be bench tested to eliminate the problem once and for all.

Good luck!


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 8:01 am
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
Toppscore wrote:
Retroverbial wrote:
What are the tranny numbers for this amp? Arjay


Fender Dual Showman Reverb
AA768 TFL5000 (silverface)
A13900 to A16500 - 1968 *** A13971 this amp's serial number

The 1968 Dual Showman Reverb Amps began to ship using SN#A13900,
making mine approx the 71st of ALL Showman Reverbs ever to be shipped
since the beginning of electricity!!!


Power Transformer PN# F022756 * Serial# 606827 = 27th Week (July) of 1968
Output Transformer PN# 022889 * Serial# 606825 = 25th Week (June) of 1968
Reverb Transformer PN# 022921 * Serial# 606811 = 11th Week (March) of 1968
Choke Serial PN# 022699 * Serial# 606744 = 44th Week (November) of 1967

** I was advised that the 1968 Dual Showman Reverbs and
the 1968 Bandmaster Reverbs began shipping in June/July of 1968.


The P/N's are correct for a DSR tranny array and the EIA codes are consistent for a 1968-era amp. However, it looks like the face plate and control knobs have been replaced with later editions of each as the OEM panel would've had the black lines and the OEM knobs would be of the snowman variety.

I remember seeing a dealer flier issued by FMI circulating in late May of '68 that announced the debut of the DSR. But it wasn't until around early August when I saw the actual amp.

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 8:27 am
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
BMW2002Ti wrote:
Topp, motorboating is most always a coupling (or more specifically an ineffective de-coupling) issue between stages. The B+ tap points supplying voltage to the plates are not electrically isolated well enough from each other. This leads to oddball positive feedback effects and that classic putt-putt tone.

Bad caps in the PS, way out of spec PS rail resistors, poor grounding are just some of the possible problems. Wiring layout can also contribute. As well as weak tubes or poor alignment of components on the board. Whole amp should be bench tested to eliminate the problem once and for all. Good luck!


Thank you. I had an opto-coupler replaced on my Twin Reverb.
Probably, to solve a motorboarding issue? Maybe?

_________________
Image


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 8:36 am
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
Retroverbial wrote:
The P/N's are correct for a DSR tranny array and the EIA codes are consistent for a 1968-era amp. However, it looks like the face plate and control knobs have been replaced with later editions of each as the OEM panel would've had the black lines and the OEM knobs would be of the snowman variety. I remember seeing a dealer flier issued by FMI circulating in late May of '68 that announced the debut of the DSR. But it wasn't until around early August when I saw the actual amp. Arjay


I do not know what to say.

_________________
Image


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 9:59 am
Offline
Rock Star
Rock Star
User avatar

Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6544
Topp, I didn't read through this entire thread.... but motorboating and ticking from an opto-coupler are two different animals. Pull one leg of that opto-bug. Still have motorboating? Then, forget the opto-bug until the motoroboating issue is resolved.

If lifting the leg of the opto-bug stops the "motorboating" or ticking. Concentrate on the dressing and component in that area.

Good luck!


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 12:43 pm
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
BMW2002Ti wrote:
Topp, I didn't read through this entire thread.... but motorboating and ticking from an opto-coupler are two different animals. Pull one leg of that opto-bug. Still have motorboating? Then, forget the opto-bug until the motoroboating issue is resolved. If lifting the leg of the opto-bug stops the "motorboating" or ticking. Concentrate on the dressing and component in that area. Good luck!


Thanks again, Beemer. You have been very kind and gracious.

I just dropped off the Dual Showman Reverb at the amp repair store.
It will be two weeks. We tested it and the motorboarding is strong.
Elsewise, it is a great amp.

I have my new Weber Mass 200 (WITH HEADPHONE JACK OPTION!!!!)
set to arrive today/tomorrow. I may want to totally fix-up this
100w Showman Reverb and crank it like Dick Dale or Link Wray,
or Eddie Van Halen playing Eruption :shock:


. . . . and, all these sounds at Bedroom Level volume or headphone tone.
Thank you, Weber Mass 200 with your headphone jack option :mrgreen:

Also, I have other amp heads that will need to be tamed. Toppscore 8)

_________________
Image


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 12:51 pm
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
Retroverbial wrote:
The P/N's are correct for a DSR tranny array and the EIA codes are consistent for a 1968-era amp. However, it looks like the face plate and control knobs have been replaced with later editions of each as the OEM panel would've had the black lines and the OEM knobs would be of the snowman variety.

I remember seeing a dealer flier issued by FMI circulating in late May of '68 that announced the debut of the DSR. But it wasn't until around early August when I saw the actual amp. Arjay

Well, the pros at the amp store did not think much of the Dual Showman Reverb
with or without the black lines and the knobs not having the snowman "8"s.
I will have to take that thought under advisement, counselor.
Maybe force a non-disclosure sealed under court orders.

Not saying good or bad or right or wrong, but, I will not sleep until I have answers.

Thanks for the awareness moment. Toppscore 8)

I cannot take alteration surprises, anymore.

_________________
Image


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Fri May 18, 2012 1:59 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Wed Mar 31, 2010 12:48 am
Posts: 26417
Location: Tombstone Territory
I was never a fan of the DSR either. According to Fender's January 1969 price guide, the amp (head only) retailed for $505. For twenty bucks more you could buy a Twin Reverb -- with its pair of 12-inch speakers.

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Sat May 19, 2012 6:14 am
Offline
Professional Musician
Professional Musician

Joined: Sun Nov 20, 2011 3:16 am
Posts: 2337
Retroverbial wrote:
I was never a fan of the DSR either. According to Fender's January 1969 price guide, the amp (head only) retailed for $505. For twenty bucks more you could buy a Twin Reverb -- with its pair of 12-inch speakers. Arjay


Sorry, I was not clear. The amp is impressive enough,
they were uncaring if there were black lines or snowman "8"s
or no black lines or no snowman "8"s..

What do you have with a
twin reverb chassis and no speakers? Showman Reverb
twin reverb chassis and a 1x15 cabinet? VibroSonic Reverb
twin reverb chassis and a 2x12 cabinet? Twin Reverb
twin reverb chassis and a 4x12 cabinet? Quad Reverb
twin reverb chassis and a 6x10 cabinet? Super Six Reverb

Speaker loads from the Twin Reverb Chassis's output transformer
will be able to handle 4ohm-8ohm loads.
Twin Reverb: 4 ohms
Dual Showman Reverb: 4 ohms
Quad Reverb: 4 ohms
Super Six Reverb: 5.3 ohms
Vibrosonic Reverb: 8 ohms
Therefore, any Vibrosonic Reverb, Dual Showman Reverb,
Twin Reverb, Quad Reverb and Super Six Reverb

The classis Twin Reverb chassis can fit into five different Fender cabinets,
and the physical size of each cabinet will exactly match the chassis's size.
No need to change any tubes or output transformer. All will take the same.

The Twin Reverb OT is designed for loads from 4 to 8 ohms. Any of the
above speaker configurations can and have been safely used with the OT.

_________________
Image


Top
Profile
Post subject: Re: 1968 Fender Showman Reverb Vibrato Speed Intensity probl
Posted: Sat May 19, 2012 6:15 pm
Offline
Rock Star
Rock Star
User avatar

Joined: Wed Feb 17, 2010 11:38 am
Posts: 4333
Location: Tennessee
Yeah,but can you play music with it? :lol:


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 33 posts ]  Go to page Previous  1, 2, 3  Next
Go to page Previous  1, 2, 3  Next

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: