Gretsch 6159 Schem Question

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tonewood
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Gretsch 6159 Schem Question

Post by tonewood »

At the output from V2 pin 1 (the guitar input section)-
Does this output see a load of 270k||282k=138k?
Does the input at pin 7 get about 1/22 of the output of pin 1?
If so, why build it up then knock it down that much? (It isn't a hi gain amp)

Trem question:
Where does the trem tie into the signal chain? :oops:

Thanks
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cbass
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Re: Gretsch 6159 Schem Question

Post by cbass »

Can't see the schematic but a lot gretsch(valco) amps tied the trem to a preamp tube cathode
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chief mushroom cloud
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Re: Gretsch 6159 Schem Question

Post by chief mushroom cloud »

looks to me like it modulates pin3 of V2 (note 'A' connection)
Don't overthink it. Just drink it.
tonewood
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Re: Gretsch 6159 Schem Question

Post by tonewood »

Thanks- both of your comments agree with each other and are probably correct. That is also what I thought at first glance. Then I saw that the cathode resistor is fully bypassed by a 35uf cap so I thought the AC "feedback" wouldn't be seen across the resister. My understanding of the bypass CAPACITOR must be incorrect. Any explanation would be great. Thanks

Edit: changed the word resistor to capacitor :oops:
Last edited by tonewood on Mon Jul 02, 2012 2:11 pm, edited 1 time in total.
rock_mumbles
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Re: Gretsch 6159 Schem Question

Post by rock_mumbles »

As far as the reason for knocking the input triode signal down to ~1/20 ... look at the Supro s6424 it has the same input stage but the input stage goes directly to the phase inverter not into another triode.
tonewood
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Re: Gretsch 6159 Schem Question

Post by tonewood »

rock_mumbles wrote:As far as the reason for knocking the input triode signal down to ~1/20 ... look at the Supro s6424 it has the same input stage but the input stage goes directly to the phase inverter not into another triode.
Thanks for the amp pointer.
But, why build it up then knock it down that much? (It isn't a hi gain amp)
Why not just go directly to the phase inverter like the s6426? The extra 270k at the grid and the extra 100k anode resistor seem like asking for extra noise with little tone change.
Thanks
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