Fender Blackface Vibroverb

Completed amps from Fender, Orange, Hiwatt, Vox, etc.

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Roe
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Re: Fender Blackface Vibroverb

Postby Roe » Mon Jun 12, 2017 7:34 am

Yeah, that's the aa763 - those are rare and valuable
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Re: Fender Blackface Vibroverb

Postby Freebird » Mon Jun 12, 2017 11:45 am

Roe wrote:Yeah, that's the aa763 - those are rare and valuable


Thanks Roe

:thumbsup: Good to know they are rare and valuable. The amp holder told me he has to be very careful if he is doing gigs with this amp. Someone has always to keep an eye on it.

Daniel

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Re: Fender Blackface Vibroverb

Postby Freebird » Fri Jun 16, 2017 8:16 am

Hi forum members

Do I have to swap the brown Astron tone caps on the main circuit board: https://www.dropbox.com/sh/fy1uup7kduemybn/AAC-uHEHp4licvOMgKOe6Vy7a?dl=0&preview=IMG_3797.jpg? Can they get bad over time? The blue molded I think rarely need replacement, isn't it so?

Any related input is welcome! Thanks,

Daniel

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Re: Fender Blackface Vibroverb

Postby danman » Fri Jun 16, 2017 9:13 pm

Are you referring to the big, round electrolytic caps on the board? If so, then yes...it's a good idea to swap those also as they are way past their useful life. I also saw a brown drop on your board I believe. They are film caps and they do not suffer the effects of time like electrolytics do.

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Re: Fender Blackface Vibroverb

Postby Freebird » Sun Jun 18, 2017 7:54 am

danman wrote:Are you referring to the big, round electrolytic caps on the board? If so, then yes...it's a good idea to swap those also as they are way past their useful life. I also saw a brown drop on your board I believe. They are film caps and they do not suffer the effects of time like electrolytics do.


Hi danman

Thank you for your response. Yes, referring to the big oily paper caps on the cathode: three of them have 2x25uF/25VDC
and one has 25uF/25VDC . I then will swap them too.

The smaller browny ones seems for me also that they are film caps. I let them as they are in.

Daniel

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Re: Fender Blackface Vibroverb

Postby danman » Mon Jun 19, 2017 7:36 pm

Yes...the 25uf/25v are well past their useful life. If the amp is a player, I would want to replace them with fresh caps.

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Re: Fender Blackface Vibroverb

Postby Freebird » Sat Jun 24, 2017 5:19 am

danman wrote:Yes...the 25uf/25v are well past their useful life. If the amp is a player, I would want to replace them with fresh caps.


Thanks danman for your confirmation. The amp is a player and has to be it for further 25 or 50 years :D .

Daniel

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Re: Fender Blackface Vibroverb

Postby Freebird » Sat Jun 24, 2017 5:37 am

Today I swapped the Astron tone caps (2x25uF/25 VDC) on the main board with new TAD's (2x25uF/25 VDC). After I soldered out the old brown Astron caps I measured them against TAD: Here the approximate values:

Astron: 45-70 uF and ESR 1.9-6.5 Ohm at 1 kHz (a very bad one has 8.5 nF nano! and ESR 28 kOhm kilo!)
TAD: 24-24.5 uF and ESR 0.11-0.12 Ohm at 1 kHz

It confirms, that the old Astron Caps has to be replaced with new ones. Enclosed a picture: https://www.dropbox.com/s/vvkjnvw1b8woylz/IMG_3928.JPG?dl=0

Daniel

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Re: Fender Blackface Vibroverb

Postby danman » Sat Jun 24, 2017 8:47 pm

The amp should sound great when your done!!


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