Hi diyAudio forum

paul robertson · 23rd March 2009, 12:30 AM

I'm a new member located in Sydney Australia.

I was moved to join after browsing your forum for help on
a problem I have with my GK 700RB bass guitar head.

By plugging in what was a short circuited lead into the output
plug of the head, I have damaged it.

On examination, I have found an electrolytic cap has exploded
and there are a number of resistors burnt on the power stage.

I'm looking to acquire some advice on how to get the unit operational again.

I hope I can just acquire the caps and the resistors I need. I have contacted GK about getting some information (schematic, bill of materials, parts specification)

I have an electronics background so will have no problem doing the actual parts replacement.

planet10 · 23rd March 2009, 02:10 AM

Welcome to the forum...

Is the GK tube or SS? (an indication of where a post for help should go)

dave

Richard Ellis · 23rd March 2009, 03:31 AM

Sad to say it is Solid State..............as an homage to tube amps it does have its G.I.V.E. system...or Gate Induced Valve Effect.
Do yourself a favor & find a true valve amp for your guitar. This is rated for 380 Watts and a "smaller" second 50 Watt amp. Why so much power I wonder?

Oh..By the way welcome Paul!
__________________________________________Rick.... .......

paul robertson · 28th March 2009, 08:27 AM

Thanks for the welcome Rick and Dave. Really an international forum. BTW - I have been in touch with Gallien and have acquired the schematic for the power stage so things are looking up.

Cal Weldon · 28th March 2009, 05:42 PM

Hello Paul and welcome to the forums.

23rd March 2009, 12:30 AM	#1
paul robertson diyAudio Member Join Date: Mar 2009	Hi diyAudio forum I'm a new member located in Sydney Australia. I was moved to join after browsing your forum for help on a problem I have with my GK 700RB bass guitar head. By plugging in what was a short circuited lead into the output plug of the head, I have damaged it. On examination, I have found an electrolytic cap has exploded and there are a number of resistors burnt on the power stage. I'm looking to acquire some advice on how to get the unit operational again. I hope I can just acquire the caps and the resistors I need. I have contacted GK about getting some information (schematic, bill of materials, parts specification) I have an electronics background so will have no problem doing the actual parts replacement.

23rd March 2009, 02:10 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Welcome to the forum... Is the GK tube or SS? (an indication of where a post for help should go) dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

28th March 2009, 05:42 PM	#5
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hello Paul and welcome to the forums. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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23rd March 2009, 03:31 AM	#3
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	Sad to say it is Solid State..............as an homage to tube amps it does have its G.I.V.E. system...or Gate Induced Valve Effect. Do yourself a favor & find a true valve amp for your guitar. This is rated for 380 Watts and a "smaller" second 50 Watt amp. Why so much power I wonder? Oh..By the way welcome Paul! __________________________________________Rick.... .......

28th March 2009, 08:27 AM	#4
paul robertson diyAudio Member Join Date: Mar 2009	Thanks for the welcome Rick and Dave. Really an international forum. BTW - I have been in touch with Gallien and have acquired the schematic for the power stage so things are looking up.

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