clean volume problem.

[Frankie]

I have problems with the clean volume on my new ODS 100w, #0124 build.
I can`t get the clean loud enough. The fet sounds in the right direction, and the OD is also loud enough, but the clean on this 100w, is much lower than my ODS hrm 50w clean. I have changed input, the signal cable on V1 a and b side, grid resistors on V1 a and b side. bypassed the relay between clean and OD. disconnected the fet board. changed the volum pot. Moved the cables and lead dress. All voltages measured are fine. Sound is also kind of dull! Checked all solder joints, and given heat to melt them a second time.
Anyone who had a similar problem with their build?

[tubedogsmith]

and you've tried a new tube in V1?

[guitardude57]

Try another tube........these days it is common to find lousy tubes out of the box.

Check resistor and pot values to/from V1
Sometimes a value is misread, and you wonder where the problem is...
I meter mine before I solder them in to check for actual values. Old eyeballs.......

If you have shiny solder joints, they are probably fine.

[Frankie]

and you've tried a new tube in V1?

Yes. Same with other tubes.

[Frankie]

Try another tube........these days it is common to find lousy tubes out of the box.

Check resistor and pot values to/from V1
Sometimes a value is misread, and you wonder where the problem is...
I meter mine before I solder them in to check for actual values. Old eyeballs.......

If you have shiny solder joints, they are probably fine.

The values are fine. I also meter mine before I solder them in.

[guitardude57]

what kind of input jack are you using? Is the 1 meg connected right? If not, becomes a signal sucker....

[talbany]

Try disconnecting the wire from the V1b coupling cap to the relay board.. Run a jumper from the coupling cap to the input to the PI.. See what that does.. This bypasses the relay master vol and effects loop connections.. If the volume comes back you know it's not in the tone stack and switching..You could also use the preamp out to another amp or the return from another preamp..Try and narrow it down ..Good Luck!!
BTW if you don't have the 1M resistor wired right on the input jack the amp will squeal if you unplug the cable from the jack.. The grid needs to see a load.. Tony

[Frankie]

I did hook up the preamp from my ODS non HRM 50w to my ODS non hrm 100w today. The amp plays twice as loud with the 50w preamp. They are wired the same. I still can`t find anything that should cause this problem.
Anyone that have had any similar problems?

Frank

[Structo]

there may be a wire whisker or some other debris partially shorting your signal out.

Remember that V1 feeds V2 for the OD so V1 must be doing ok if your OD volume is normal.

Probably a silly wiring error.

[Frankie]

there may be a wire whisker or some other debris partially shorting your signal out.

Remember that V1 feeds V2 for the OD so V1 must be doing ok if your OD volume is normal.

Probably a silly wiring error.

When I use the fet input the amp is loud as it should be.
The internal pot is set to 11 o`clock 7,2 K ohm.
It reads 5.6 K at 12 o`clock, but then it`s to loud.
Why does the fet input play as normal, but not the normal input. They use the same wire to V1a??

[Bob-I]

I had the same issue with one build. Turned out to be a bad relay.

Since the OD is fed from the clean, and the OD is fine, the issue is most likely something in the switching system. I'd start by disconnecting the relay and hardwiring the clean section to the output. If the problem persists examine V1 more closely, plus then the OD isn't truly right.

Good luck

[Frankie]

I had the same issue with one build. Turned out to be a bad relay.

Since the OD is fed from the clean, and the OD is fine, the issue is most likely something in the switching system. I'd start by disconnecting the relay and hardwiring the clean section to the output. If the problem persists examine V1 more closely, plus then the OD isn't truly right.

Good luck

I have done that too! Same volume on clean.
It`s a true mystery.:(
Must be something that is causing the clean to load down, but when engaging the OD the clean will operate normal. Causing the OD to sound in the right direction.
Did change everything from the input to the V1a, and from V1b to the V pot including the pot. wires and res, and caps. NO difference!

FRH

[mojotom]

Check the jacks, on my build the Fet input jack (metal jack 13E I think) had bad connection sometimes so the amp loses volume on the normal input because the unused Fet input was not making a good contact from the input jack tip to V1a 22k.

[Bob-I]

I had the same issue with one build. Turned out to be a bad relay.

Since the OD is fed from the clean, and the OD is fine, the issue is most likely something in the switching system. I'd start by disconnecting the relay and hardwiring the clean section to the output. If the problem persists examine V1 more closely, plus then the OD isn't truly right.

Good luck

I have done that too! Same volume on clean.
It`s a true mystery.
Must be something that is causing the clean to load down, but when engaging the OD the clean will operate normal. Causing the OD to sound in the right direction.
Did change everything from the input to the V1a, and from V1b to the V pot including the pot. wires and res, and caps. NO difference!

FRH

Time to get out the scope and sine wave generator and look for where the gain is getting lost. Since all the components have been replaced, there must be a mistake somewhere in the layout, connections, wiring.

[ampdork]

Voltages spot on?

Do check the switching jacks like recommended... I had many problems with switchcrafts in the past....I no longer use them because of so many issues.

The best was the effects loops getting poopy. Can sound very much like a bad speaker or cold solder joint....usually won't show up on the bench, only on a cab. ;O)

Good luck. Whatever it is it will be something super simple....it always is.