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Post subject: 68 Deluxe Reverb distorts strongly when cranked
Posted: Thu Mar 22, 2018 1:07 pm
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HI Guys

Was getting this weird issue with my BFDR when I turned up beyond 6. It distorts (as it should) but theres also a layer of cutting in and out (sort of a crackling, farty, clipping sound)

I just replaced all the tubes with brand new JJs and bias'd to see if that fixed it...didnt.

https://www.youtube.com/edit?o=U&video_ ... feature=vm

Any thoughts. Im guessing old caps or resistors? Where should I look?


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Thu Mar 22, 2018 4:43 pm
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https://youtu.be/Dyq6ILm1VIs

Sorry I think that link didn't work


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Thu Mar 22, 2018 7:06 pm
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Both channels?


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 1:05 am
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If you put all know good tubes ;

V6 and V3 must be 12AT7 , not 12AX7
Solders in power supply . Reheat
Resistors in Phase inverter circuit ,resistors at V6 ; disconnect one side of resistors and read ohms
Output transformer.


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 11:32 am
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upnorth2 wrote:
Both channels?


Yep, just tried the 2nd channel. Same thing


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 11:34 am
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stratele52 wrote:
If you put all know good tubes ;

V6 and V3 must be 12AT7 , not 12AX7
Solders in power supply . Reheat
Resistors in Phase inverter circuit ,resistors at V6 ; disconnect one side of resistors and read ohms
Output transformer.


V6 and V3 are correct with JJ ECC81 (12at7)
Solders in power supply . Reheat Specifically the filter caps in the Doghouse?
Resistors in Phase inverter circuit ,resistors at V6 ; disconnect one side of resistors and read ohms Ok, ill check that after I look at the solder
Output transformer...hope not :)


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 11:53 am
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If it's never been serviced I would start by replacing the caps/resistors on the filter cap board, screen and grid resistors on the 6V6's, cathode caps and resistors (if needed) to start with.

UN


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 12:37 pm
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ParksideDrive wrote:
stratele52 wrote:
If you put all know good tubes ;

V6 and V3 must be 12AT7 , not 12AX7
Solders in power supply . Reheat
Resistors in Phase inverter circuit ,resistors at V6 ; disconnect one side of resistors and read ohms
Output transformer.


V6 and V3 are correct with JJ ECC81 (12at7) Yes
Solders in power supply . Reheat Specifically the filter caps in the Doghouse?

These and other on the main board


Resistors in Phase inverter circuit ,resistors at V6 ; disconnect one side of resistors and read ohms Ok, ill check that after I look at the solder
Output transformer...hope not :)


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 12:39 pm
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upnorth2 wrote:
If it's never been serviced I would start by replacing the caps/resistors on the filter cap board, screen and grid resistors on the 6V6's, cathode caps and resistors (if needed) to start with.

UN



Only if Parkside drive know how , if not he can do more damage than good job


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 12:45 pm
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upnorth2 wrote:
If it's never been serviced I would start by replacing the caps/resistors on the filter cap board, screen and grid resistors on the 6V6's, cathode caps and resistors (if needed) to start with.

UN
Definitely sprague Atoms in the doghouse..


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Fri Mar 23, 2018 4:05 pm
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stratele52 wrote:
upnorth2 wrote:
If it's never been serviced I would start by replacing the caps/resistors on the filter cap board, screen and grid resistors on the 6V6's, cathode caps and resistors (if needed) to start with.

UN



Only if Parkside drive know how , if not he can do more damage than good job


I agree. If you're not comfortable/qualified take it to a trustworthy tech. Money well spent.

UN


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Mon Mar 26, 2018 6:13 am
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Try a little Deoxit D100 on all the tube pins. Work them into and out of sockets a few times.

Good luck! :)

https://www.amazon.com/CAIG-Laboratorie ... eoxit+d100


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Mon Mar 26, 2018 6:44 am
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ParksideDrive,

Story of the amp may help ;

Did the amp always do that since you have it ?
Did you bought from second hand few days ago ? .
Did you use single coil guitar or humbucker ?


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Mon Mar 26, 2018 11:42 am
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[quote="BMW2002Ti"]Try a little Deoxit D100 on all the tube pins. Work them into and out of sockets a few times.

Thanks Beemer! I haven't done this, but I should note that this problem only occurs when the amp is cranked above 6...Below 5, no issues. Im guessing its not dirty sockets? Or could it still be?, given the volume variable...


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Post subject: Re: 68 Deluxe Reverb distorts strongly when cranked
Posted: Mon Mar 26, 2018 11:44 am
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Thanks Stratele

Did the amp always do that since you have it ? No, this a new problem,
Did you bought from second hand few days ago ? Ive had the amp for several years, didnt notice this before (but also, didn't crank it up that often)
Did you use single coil guitar or humbucker ? Humbucker Ephiphone Les Paul


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