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  1. #1
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    Default Help! I can't read amp schematics!

    I have a fender 30 amp from the early 80s. I've managed to identify the functions of v1 thru v6 tubes with the exception of v5. I cannot find any resources online for this amp other than the descriptions of other similar fender blackface amps. V5 is usually the tremolo driver in these similar amps, but my amp doesn't have tremolo. Can anyone tell me what this tube does? I got the schematics (attached) but it reads like hyroglyphics to me! Any help is appreciated!

    http://cloud.tapatalk.com/s/59893a7a...hematic%29.pdf

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  2. #2
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    As I recall, the 30 is a two-channel amp. Could be that v4 and v5 are two separate pre-amp tubes, one for the normal channel and one for the reverb channel. I can't read that schematic but I found a wiring diagram for a Pro, basically a schematic called a "layout" and it was easier to read. On that amp, V4 goes to the instrument channel and v5 goes to the microphone channel.
    The Human Torch was denied a bank loan.

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    Quote Originally Posted by tele savalas View Post
    As I recall, the 30 is a two-channel amp. Could be that v4 and v5 are two separate pre-amp tubes, one for the normal channel and one for the reverb channel. I can't read that schematic but I found a wiring diagram for a Pro, basically a schematic called a "layout" and it was easier to read. On that amp, V4 goes to the instrument channel and v5 goes to the microphone channel.
    Correct. It is a 2 channel amp. V1 is the 1st stage of the normal channel. V2 is the 1st stage of the reverb channel. V3 is the reverb driver. In other blackface fenders, V4 is identified as reverb return and 2nd stage of normal channel. Just wasn't sure what V5 does.

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    I'm guessing that v5 is the phase inverter. See the link below. The 30 isn't listed there, but I've read that the design was inspired by the Deluxe. Mike Kropotkin could probably tell you the exact tube assignments for your 30, as I suspect that he has sold tubes to a lot of 30 owners who knew the potential of this amp.

    https://www.kcanostubes.com/content/...ecommendations
    The Human Torch was denied a bank loan.

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    Quote Originally Posted by tele savalas View Post
    I'm guessing that v5 is the phase inverter. See the link below. The 30 isn't listed there, but I've read that the design was inspired by the Deluxe. Mike Kropotkin could probably tell you the exact tube assignments for your 30, as I suspect that he has sold tubes to a lot of 30 owners who knew the potential of this amp.

    https://www.kcanostubes.com/content/...ecommendations
    This is a great resource. Thanks. It confirms the designations I've researched. On my amp, V6 is the phase inverter. V5 is still a mystery as to it's function on my non tremolo amp. The amp's literature has V5 as a 12ax7/ 7025. Maybe another gain stage or the push/ pull boost knobs, maybe?

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    Sorry - didn't know you had a V6. Reach out to Mike. He's pretty good at answering e-mails.
    The Human Torch was denied a bank loan.

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  10. #7
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    With my limited knowledge, it is a preamp tube and seems to be part of the Treble boost/preamp gain switching circuits.
    Whether you think you can...or you can't...you're right!

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    Quote Originally Posted by gpower View Post
    With my limited knowledge, it is a preamp tube and seems to be part of the Treble boost/preamp gain switching circuits.
    Gary! So good to see you around these parts again!
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  13. #9
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    Thanks Myk, been away for far too long.
    Whether you think you can...or you can't...you're right!

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    V5 is the pre-amp gain driver (pull switch) on the reverb channel. It's only using half of the triode.
    I'm a riddle, wrapped in a mystery, inside an enigma.

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