SLO build

General discussion area for tube amps.

Moderators: pompeiisneaks, Colossal

User avatar
roberto
Posts: 1841
Joined: Tue Nov 27, 2007 4:45 pm
Location: Italy

Re: SLO build

Post by roberto »

Hi, avoid that blue tape. The chassis becomes warm and the tape tells you bye bye.
Also, shorten all those wires and make them as straight as possible.
User avatar
Structo
Posts: 15446
Joined: Wed Oct 17, 2007 1:01 am
Location: Oregon

Re: SLO build

Post by Structo »

I really pray that this thread will come to a good conclusion.

In that, I hope the OP will follow up and tell us about his amp and possibly sound clips would be excellent!

I have loved the SLO sound for years, and I am not even sure I have ever heard one live, so it would be cool if you posted some clips when you are done.

Thanks!
Tom

Don't let that smoke out!
dcribbs1412
Posts: 1377
Joined: Wed Jun 11, 2008 6:56 pm
Location: Arizona Desert

Re: SLO build

Post by dcribbs1412 »

Structo wrote:I really pray that this thread will come to a good conclusion.

In that, I hope the OP will follow up and tell us about his amp and possibly sound clips would be excellent!

I have loved the SLO sound for years, and I am not even sure I have ever heard one live, so it would be cool if you posted some clips when you are done.

Thanks!
Thanks for the prayer Tom
Spark test went good...
I have sound... quick check of voltages and they are in line
some hum to track down but was expected
has something to do with channel switching, OD has a slight hum
Normal channel is humming pretty loud..maybe footswitch
I'm hoping I can track this down and report back.


Darin
dcribbs1412
Posts: 1377
Joined: Wed Jun 11, 2008 6:56 pm
Location: Arizona Desert

Re: SLO build

Post by dcribbs1412 »

Tracked the humming down to the footswitch jack, grounded it
much quieter now.
Clean channel seems good...crunch switch adds some noise
especially if holding on to the barrel of switch?
OD channel is really muffled and compressed sounding
tube swap made no difference.
will double check values
any suggestions are appreciated

Darin
Sargent
Posts: 12
Joined: Thu Oct 31, 2013 5:52 pm

Re: SLO build

Post by Sargent »

Well. Seems I'm in the same boat as you...kind of. My SLO-100 is working fine...on the clean channel. No hum or noise and NO distortion. All my clean/crunch switch does is give me more volume on the Crunch channel. I think you are on the right track checking component values. Although I received a small schematic from Ampclones indicating the missing values for the dc heater mod I still haven't gotten the correct schematic for the mainboard. Still unsure about many of the values on the board. I did get some advice about the BIAS and was able to dial that in. Great amp if you like mellow music...which I don't.
dcribbs1412
Posts: 1377
Joined: Wed Jun 11, 2008 6:56 pm
Location: Arizona Desert

Re: SLO build

Post by dcribbs1412 »

Sargent wrote:Well. Seems I'm in the same boat as you...kind of. My SLO-100 is working fine...on the clean channel. No hum or noise and NO distortion. All my clean/crunch switch does is give me more volume on the Crunch channel. I think you are on the right track checking component values. Although I received a small schematic from Ampclones indicating the missing values for the dc heater mod I still haven't gotten the correct schematic for the mainboard. Still unsure about many of the values on the board. I did get some advice about the BIAS and was able to dial that in. Great amp if you like mellow music...which I don't.
Hi Sargent
bummer you cant get a schem from the PCB vendor
Not sure if Smash is selling his boards on the SLO forum anymore(maybe PM him) or maybe look at the grabbing the C3 boards and do a rebuild.
just a thought

Darin
John_P_WI
Posts: 1456
Joined: Wed Aug 15, 2007 4:29 pm
Location: Wisconsin

Re: SLO build

Post by John_P_WI »

Sargent wrote:What does that tell you?
Most likely it tells us that Abube has his own use and design with this board and it is multi-purpose or that he is in over his head with the switching circuit... pick your choice.
dcribbs1412
Posts: 1377
Joined: Wed Jun 11, 2008 6:56 pm
Location: Arizona Desert

Re: SLO build

Post by dcribbs1412 »

Grounded the channel switch crunch and bright switch to chassis and
they quieted down a lot...
Still have the muffled OD channel
components seem to check out fine
wondering if grounding all the pots to chassis would make a difference?
Sargent
Posts: 12
Joined: Thu Oct 31, 2013 5:52 pm

Re: SLO build

Post by Sargent »

This is the answer I received from Ampclones...still no mention about the mini relay on the board...
Problem is caused by an error in switching matrix or faulty LDR. Try to bypass second tone stack...desolder and run bypass wire. Also, short LDRs which are part of the OD channel path (on a resistor side of LDR) with the croco clamp to exclude the fact of faulty LDR...
Seems problem is in switching supply. Not entirely sure how to check LDR's but I did supply voltage to + and - with an old 9V battery after removing LDR's and checked resistance on other end with a meter. In each case I received a different resistance up to about 20K in each case most likely due to a drop in voltage of the battery.
Tried his shorting method with an alligator clip and received NO output.
NO new schematic has been sent with all the values present.
Not sure why this posted twice. Got error from first attempt.
dcribbs1412
Posts: 1377
Joined: Wed Jun 11, 2008 6:56 pm
Location: Arizona Desert

Re: SLO build

Post by dcribbs1412 »

Sargent
maybe you could start a new thread
so as not to mix up the builds and move too far off topic
hopefully Tom the Mod can move or delete stuff
Thanks
Darin
User avatar
Structo
Posts: 15446
Joined: Wed Oct 17, 2007 1:01 am
Location: Oregon

Re: SLO build

Post by Structo »

Yes, Sarg please start a new thread about your amp.
It becomes confusing when there is another amp in the thread.

Someone will be able to help you more if you start your own thread.

Thanks!
Tom

Don't let that smoke out!
dcribbs1412
Posts: 1377
Joined: Wed Jun 11, 2008 6:56 pm
Location: Arizona Desert

Re: SLO build

Post by dcribbs1412 »

Thanks Tom
appreciate your time

D
Sargent
Posts: 12
Joined: Thu Oct 31, 2013 5:52 pm

Re: SLO build

Post by Sargent »

I have already decided to stop posting. No need to beat a dead horse!
User avatar
Blindog
Posts: 475
Joined: Sat Oct 14, 2006 5:02 am
Location: Atlanta

Re: SLO build

Post by Blindog »

Sargent wrote:I have already decided to stop posting. No need to beat a dead horse!
Hey Sarge, I wouldn't stop posting...like Tom said, you're more likely to get help if you have your own thread. It just gets a bit confusing with 2 different builds. I'd like to see you get your issues resolved, plus it could help someone else with the same problem down the road! :)

Mark
"- Yeah, can we have everything louder than everything else? Right!"- Ian Gillan
User avatar
Structo
Posts: 15446
Joined: Wed Oct 17, 2007 1:01 am
Location: Oregon

Re: SLO build

Post by Structo »

Ditto

Sarge I didn't mean to be offensive, please start another thread on your amp.
We thrive on this stuff and I am sure somebody here can help you.

Peace!
Tom

Don't let that smoke out!
Post Reply