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Re: Kustom IV Bass Head Schematic? [message #22518 is a reply to message #22517]

Thu, 26 February 2015 11:53

corona blue
Messages: 25
Registered: January 2015

Junior Member

kustomoholic wrote on Thu, 26 February 2015 11:49

Allen.... I got the closest I could to the actual numbers....not sure what the 3 digit prefix refers to specifically but I'm glad it shed some light on the subject.. Any one have an Idea what the prefix numbers meant??????

Craig

I was thinking maybe it might signify era of ownership of the company(?)

Historically, did Kustom change hands around 1976 or '77 ?

I think some of the earlier Kustom boards from the T&R era have a 300 series prefix, right??

[Updated on: Thu, 26 February 2015 11:58]

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Re: Kustom IV Bass Head Schematic? [message #22626 is a reply to message #22106]

Sun, 08 March 2015 18:29

Muziekschuur
Messages: 27
Registered: March 2010
Location: Stavenisse

Junior Member

Did you try out to place the second (optional) eq board? Or is yours equipped with this feature? Maybe for some great Rick O Sound option of some sort?

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Re: Kustom IV Bass Head Schematic? [message #22627 is a reply to message #22626]

Sun, 08 March 2015 18:53

corona blue
Messages: 25
Registered: January 2015

Junior Member

This big K bass head was not equipped with the graphic EQ.
It just has the loop-back plug which you can see in the pics above.

Anyone who works on one of these should definitely open up that plug and thoroughly clean the contacts as this is a good place for corrosion to form causing high-resistance in the audio signal path.

While I am here, I thought I would give an update on the Big K schematics that Kustomoholic sent over to me:
I just purchased a nice HP printer/scanner and I am getting familiarized with the machine.
I may also try to clean them up a bit in a graphics program.
One of the schematics is spread over two pages. I would like to join them up to allow for 11 x 17 print out.

Should I post them here or send them to a forum admin?

Let me know!

Best,
Allen

[Updated on: Sun, 08 March 2015 18:55]

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Re: Kustom IV Bass Head Schematic? [message #22628 is a reply to message #22106]

Mon, 09 March 2015 02:45

Muziekschuur
Messages: 27
Registered: March 2010
Location: Stavenisse

Junior Member

Please do. I own the 4x15 cab. I do hope To purchase the big K AMP too.

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Re: Kustom IV Bass Head Schematic? [message #22655 is a reply to message #22628]

Fri, 13 March 2015 02:45

Muziekschuur
Messages: 27
Registered: March 2010
Location: Stavenisse

Junior Member

The big K AMP has a lid wich can Be removed and An additional eq module could Be placed.
When i Got the 415b cab i SAW the KIV AMP in person.

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Re: Kustom IV Bass Head Schematic? [message #22657 is a reply to message #22106]

Fri, 13 March 2015 06:14

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

Send what you have to Kustom Dan.

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Re: Kustom IV Bass Head Schematic? [message #22700 is a reply to message #22106]

Mon, 23 March 2015 16:39

corona blue
Messages: 25
Registered: January 2015

Junior Member

UPDATE! LINK TO DOCUMENTS...

KUSTOM IV BASS SCHEMATICS AND LAYOUT

Courtesy of VintageKustom forum member Kustomoholic...
we get by with a little help from our friends!
Single 6Mb .pdf file of 12 pages...

Thanks to all of you for your help on this project.
If anyone needs hi-rez .png files of these schematics send me a PM.

Best,
Allen

[Updated on: Mon, 23 March 2015 18:37]

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Re: Kustom IV Bass Head Schematic? [message #22702 is a reply to message #22106]

Tue, 24 March 2015 10:38

kustomoholic
Messages: 227
Registered: March 2009
Location: Tulsa,oklahoma

Senior Member

Glad to help... I think I copied you the page of exceptions to inclusivity of schematics... they are there but not specifically listed under the tabs In the IV B section... My manual has about everything else.

Craig

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Re: Kustom IV Bass Head Schematic? [message #22721 is a reply to message #22702]

Sat, 04 April 2015 14:37

corona blue
Messages: 25
Registered: January 2015

Junior Member

Hey Craig, I have been meaning to ask you, does your manual contain the PL-4 "parts list" for the IV Bass??
It is listed in the addendum sheet you gave us.
That parts list might be helpful as reference documentation for the components shown within the schematics.

Just been too busy to get over here and ask.

Best,
Allen

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Re: Kustom IV Bass Head Schematic? [message #22764 is a reply to message #22721]

Wed, 15 April 2015 15:38

kustomoholic
Messages: 227
Registered: March 2009
Location: Tulsa,oklahoma

Senior Member

Allen... That section is included in the missing sections that was supposed to be supplied at a later date.... I wish I had those supliments but alas ...no . Glad I have what I have to share even tho its abbreviated.

Craig

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Re: Kustom IV Bass Head Schematic? [message #22934 is a reply to message #22135]

Wed, 20 May 2015 23:31

eaestes
Messages: 4
Registered: May 2015
Location: Dallas

Junior Member

The Thermalloy/Aavid TO-3 socket insulator specs are pretty good. Check out the Aavid/Thermalloy catalog. I'm not sure whether the aluminum oxide ones require thermal grease, but their performance is outstanding. These have about 1650V standoff voltage and the higher the BTU/hr-ft°F rating, the better they transfer heat and the cooler the transistors will operate.

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