Not sure if this has already been posted, but Mark from Talkingbass put in a plug for a Rumble 40 as his "favorite amp for home practice".
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I have 2 other amps, a rumble studio 40, and a GK 400Rb head.
So I assume with the studio 40, I could feed it's FX out into the 800 to test, and also try feeding the 800 FX out into the studio 40. That might eliminate a little complexity using a combo, that's one less connection to make.
You can feed the Studio's Left (Mono) FX Send to the 800 HD's Instrument Input for testing, but that's like plugging in a bass there. So, really not much help.
Also, connecting a Studio FX Send to another FX Return works differently! Alas, the Studio's FX Send is very low level and cannot be adequately amplified thru the FX Return of the 800 HD. So, this will not be much help, either.
So, try the FX Send from the GK instead.
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This says a lot considering he could have said some boutique el-expensivo amp. Thanks for posting this!
You can feed the Studio's Left (Mono) FX Send to the 800 HD's Instrument Input for testing, but that's like plugging in a bass there. So, really not much help.
Also, connecting a Studio FX Send to another FX Return works differently! Alas, the Studio's FX Send is very low level and cannot be adequately amplified thru the FX Return of the 800 HD. So, this will not be much help, either.
So, try the FX Send from the GK instead.
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OK, I think I might have solved the problem. It's the goddamn headphone jack speaker cut. Or whatever you call that. Amp seems to work great, pre-amp section has zero issues when I chained the 800 FX into the Gk head. GK Head into the 800 FX return didn't work as long as the speakers weren't working on the 800 anyways. BUT, tapping the top of the amp right around where the headphone jack is made them turn back on. This works with or without the GK head in the loop. Also, if the 800 is working perfectly fine on it's own, and you plug and unplug headphones, the speakers stay off, until you tap the top of the amp again. I repeated this many times and it seems consistent, so time to take it apart and get some contact cleaner in the headphone jack.
Thanks for posting this!
That speaks pretty highly of the 40. I love mine. I'm actually contemplating re-tolexing mine and changing the grill cloth, fender logo, and giving it some cool mid-century style legs so make it a little more of an art piece. Only complaint I have about my Studio 40, it's a generic black box with a fender logo and that sells it a bit short for how cool it is.
I have an older P____ amp that needs a good whack on the top every time I turn it on. Then it works fine.
Ah! A bargain hunter, eh? I can relate. 
Whoa, dude! The ultimate bargain! 
Is this the same R800HD above that wouldn't consistently output any sound, but was a hell of a deal? 
That was a corroded switch in the FX Return jack like we discussed back then, right?
That was a corroded switch in the FX Return jack like we discussed back then, right? Groovy, baby! If you can fix that then maybe you can make someone else a hell of deal! 
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Ah! A bargain hunter, eh? I can relate.
Whoa, dude! The ultimate bargain!
Is this the same R800HD above that wouldn't consistently output any sound, but was a hell of a deal?
Groovy, baby! If you can fix that then maybe you can make someone else a hell of deal!
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Percussive maintenance fixes so many problems, unless it causes more…
Maybe to protect in case of lightning strike? My R100 is always plugged in, but to a surge-protected power strip.
What’s need got to do with it (got to do with it)?
What’s need when marketing wants flashy?
with apologies to Tina
For high wattage, Neo speakers save a lot of weight.
D
That is actually a valid operational procedure.
True story from back in the '80s, when I was working in the SCADA (Supervisory Controls And Data Acquisition) industry.
A city in Connecticut bought its electricity from a regional provider and resold it to its residents. All of the electricity came through a single substation. One day, the station tripped off-line and the entire city went dark. Neither of the two newbie techs who managed the substation knew how to read a relay-logic diagram and had no idea where the problem was or how to find it. Someone at city hall remembered the old tech who had retired and moved to a trailer park in Florida. They tracked him down, bought him a plane ticket and told him to send the city a bill for his time. The old dude wandered through the substation, reminiscing about the past, followed by the two newbies. After awhile, he asked them for a ballpeen hammer. They got him one. He walked over to a NEMA enclosure on the wall and gave it a good whack on the right side. The lights turned back on in city. Stuck relay was all it was. The newbies could see where the enclosure had been whacked other times in the past.
The oldster sent the city a bill for $2000.02, itemized as follows.
1) Whacking a box with a hammer: $0.02
2) Knowing which one: $2000.00
He could have just told them over the phone, but experience has to be earned the hard way. Geezers rule!
That is actually a valid operational procedure.
True story from back in the '80s, when I was working in the SCADA (Supervisory Controls And Data Acquisition) industry.
A city in Connecticut bought its electricity from a regional provider and resold it to its residents. All of the electricity came through a single substation. One day, the station tripped off-line and the entire city went dark. Neither of the two newbie techs who managed the substation knew how to read a relay-logic diagram and had no idea where the problem was or how to find it. Someone at city hall remembered the old tech who had retired and moved to a trailer park in Florida. They tracked him down, bought him a plane ticket and told him to send the city a bill for his time. The old dude wandered through the substation, reminiscing about the past, followed by the two newbies. After awhile, he asked them for a ballpeen hammer. They got him one. He walked over to a NEMA enclosure on the wall and gave it a good whack on the right side. The lights turned back on in city. Stuck relay was all it was. The newbies could see where the enclosure had been whacked other times in the past.
The oldster sent the city a bill for $2000.02, itemized as follows.
1) Whacking a box with a hammer: $0.02
2) Knowing which one: $2000.00
He could have just told them over the phone, but experience has to be earned the hard way. Geezers rule!
Exact same story is told with every technology ever devised by man. I think even cavemen had to go out into the woods to find where they left useless old "Uagh" when their fire wouldn't light. "Uagh" picked up a rock and hit another rock and made a spark that started the fire. "Beoh" said, "No fire when I did that!" "Uagh" said, "Must know which rock."
Old 20th century movies always show troubleshooters flicking gauges with their thumb and fingers, though the gauges rarely change from that. But, if they do, it tells you something valuable. Newer digital sensors may not, or may!, respond the same. Even modern doctors thump on your back or chest while listening with a stethoscope. When things don't flow like they should, sometimes you gotta shake 'em up a little.
.
D
I talk your point, but in this case, it was old tech that the newbies couldn't figure out. I'm sure there are other stories along that line, too. For example, I worked with a senior guy at Amoco when I worked for the Pipeline company designing SCADA products. He wouldn't retire, so management replaced him with a couple of newbies. He was too close to retirement for the company to axe him, so he just sat in his office assembling ships inside of bottles (and getting paid 6 figures for it (in the mid '80s!)). Of course, a serious problem arose on a major pipeline running from Texas up to the refinery in Whiting, IN that the newbies were clueless about and couldn't resolve it. They finally asked for his help. He solved the problem in minutes...and retired the next day, once he knew that the company knew that they needed him!Exact same story is told with every technology ever devised by man. I think even cavemen had to go out into the woods to find where they left useless old "Uagh" when their fire wouldn't light. "Uagh" picked up a rock and hit another rock and made a spark that started the fire. "Beoh" said, "No fire when I did that!" "Uagh" said, "Must know which rock."
Old 20th century movies always show troubleshooters flicking gauges with their thumb and fingers, though the gauges rarely change from that. But, if they do, it tells you something valuable. Newer digital sensors may not, or may!, respond the same. Even modern doctors thump on your back or chest while listening with a stethoscope. When things don't flow like they should, sometimes you gotta shake 'em up a little.
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