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SurfGuitar101 Forums » Gear »

Permalink Another silverface question

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gusto
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Joined: Sep 22, 2006
Posts: 234
Link Posted on Oct 21 2006 12:34 PM

Just reading the above post and was wonering if anyone can tell me if my 69 pro reverb silverface is wired the same as a blackface model that was offered up to 67. Ive heard that it is but cant find any info on the net.
Also why does the master volume silverfaces go for less than the non master volume models?

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JakeDobner
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Joined: Feb 26, 2006
Posts: 12159
Seattle
5 News Pins 5 POTD Pins 1 Map Pin
Link Posted on Oct 21 2006 01:38 PM

What circuit does your Pro Reverb use? Blackface is AA165. Being a '69 I have to venture that yours does not have the blackface circuit.

As for the Master Volume ones, they just don't sound as good. There is a reason for this I am sure but I do not know the reason. My guess is that the extra wiring for the Master Volume takes something away.

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PhatTele
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Joined: Jun 05, 2006
Posts: 445
Link Posted on Oct 23 2006 10:06 AM

Given that was in the transition years, you'll have to pop the chassis out to see if the bias circuit is the later SF style you see introduced in the late 60s/early 70s or the earlier mid-60s style. It could go either way, but it's more likely the "bias balance" of the SF era and not the "fixed bias adjust" of the mid-60s.

Also, it is more likely that your amp has a slightly hotter running power transformer which means that the amp is probably using a 5U4 rectifier instead of the 5AR4/GZ34 rectifier of the mid-60s amps. It works perfecly fine, but it produces a slight a difference in tone and attack.

Other than that, the earliest SFs are nearly identical to the latest BFs.

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gusto
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Joined: Sep 22, 2006
Posts: 234
Link Posted on Oct 24 2006 12:17 AM

Thanks for the reply, im going to have to do my amp homework you guys know way more than me.

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