Peavy Transtube 258EFX missing EFX Board

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owenmc006
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Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Tue Sep 26, 2017 11:49 am

I was given a Peavey Transtube 258EFX with the effects board missing. Is there a way to modify the amp to work clean without the effects board? I have the schematic and can solder and such but the schematic is over my head.

owenmc006
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Re: Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Wed Sep 27, 2017 2:11 pm

Looking at the schematics more closely, I think the answer is no. I can also see why Peavey is asking 122.24 for the effects board.

KTB
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Re: Peavy Transtube 258EFX missing EFX Board

Post by KTB » Wed Sep 27, 2017 7:17 pm

Post the schematic doesn't seem that undoable. You should be able to jump a wire from the eq out to power amp.

owenmc006
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Re: Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Thu Sep 28, 2017 6:05 am

Here is the schematics that Peavey sent me.
TRANSTUBE_258_EFX.pdf
Page 1, 9-13 seem to be the schematics
(2.42 MiB) Downloaded 243 times

Thanks!
Owen
Peavey Studio Pro 40
Peavey Transtube Solo

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Enzo
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Re: Peavy Transtube 258EFX missing EFX Board

Post by Enzo » Thu Sep 28, 2017 9:29 am

On that schematic, the main board schematic and the FX board schematic do not seem to line up.

owenmc006
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Re: Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Thu Sep 28, 2017 10:47 am

The schematic is the one Peavey sent me. I was thinking that the digital effects board might have been used in multiple amps> I figured it was labeled for the Transtube EFX 112 but was the same for the Transtube 258 EFX as well.
Owen
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Peavey Transtube Solo

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Enzo
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Re: Peavy Transtube 258EFX missing EFX Board

Post by Enzo » Thu Sep 28, 2017 3:08 pm

I don't doubt the file is what PV sent, but I look at the main board circuit where we see a 9-pin connector, but the connector on the FX card is 12 pins, very unusual for a ribbon to have different number wires at each end. The 14 pin connector seems to have no function here.

owenmc006
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Re: Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Thu Sep 28, 2017 9:11 pm

Thanks. I will contact Peavey again and see if they send the correct EFX board schematics this time.
Owen
Peavey Studio Pro 40
Peavey Transtube Solo

owenmc006
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Re: Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Wed Oct 04, 2017 9:57 am

Did not hear back from Peavey with Digital Effects board schematic. Still going over the main board focusing on the ribbon wires that go to the EFX board. What it looks like to me.

Skip this post an go to the next one. It correlates what I tried to trace with what I believe is the correct pins on the Effects Board.

P14 the two ribbon wires going to EFX board - Feeds power to the board from capacitors- Power fluctuates on theses leads.

P1 the nine pin ribbon wire. going to EFX board
1- 15v positive
2- 15v negitive
3- not used
4- clean channel
5- equalizer out
6- negative to the power amp
7- positive to the power amp
8- not sure
9- lead channel

I would like to by pass the EFX board and just use the clean channel. The clean/lead switch was on the EFX board as well. Any ideas?

Thanks
Last edited by owenmc006 on Wed Oct 04, 2017 11:53 am, edited 1 time in total.
Owen
Peavey Studio Pro 40
Peavey Transtube Solo

owenmc006
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Re: Peavy Transtube 258EFX missing EFX Board

Post by owenmc006 » Wed Oct 04, 2017 10:50 am

Correlating the main board to what I believe the EFX board would be if the one Peavey sent relates to the the Transtube 258. Sent Transtuve 112

P14 the two ribbon wires going to EFX board - Feeds power to the board from capacitors- Power fluctuates on theses leads.
Numbers 2 and 3 on EFX board +40 and ground

P1 the nine pin ribbon wire. going to EFX board
1- 15v positive EFX 4 15v positive
2- 15v negitive EFX 5 15v negative
3- not used EFX 6 NC
4- clean channel EFX 7 Preout
5- equalizer out EFX 8 Preout ground
6- negative to the power amp EFX 9 EFX out
7- positive to the power amp EFX 10 EFX ground
8- not sure EFX 11 Channell
9- lead channel EFX 12 Clean

So I jumped Preout to EFX out and Preout ground to EFX Ground. The clean channel led lights and the volume and equalizer work.

So now, to figure out how to wire in a clean and lead switch. I would guess some how on Channel and Clean.
Owen
Peavey Studio Pro 40
Peavey Transtube Solo

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