Hiwatt Gurus: Help your friend Bob!

[Hiwatt Bob]

Oh man. Hopefully it's not fried. The fuse blew after a second or two--

Bringing it to Savage tomorrow. Maybe they'll let me borrow a Blitz 50 while the watt is getting fixed up.

[Hiwatt Bob]

thought i should update:

got my baby back from Savage. it was just a fried resistor in the power supply. whew--transformers are fine, everything else was fine too. wanted to try some winged-c's, so they put those in.

played for about 2 hrs last night--no effects (just for you mike B).

[Dr.HI-TONE]

Great News!

[OldSchoolDave]

got my baby back from Savage. it was just a fried resistor in the power supply. whew--transformers are fine, everything else was fine too.

Really good to hear!

Kudos to the folks at Savage for not taking the "rip and replace" approach. I'll file that one away for future reference .

Dave

[Hiwatt Bob]

well. that was quick.

it's doing the exact same thing again.
it was working great, sounded just as good as ever. all the tubes are fine, fuses seem ok. just no sound comes out.
looks like it's back to savage.

::scratches head::

[philmanatee]

Bummer!

[Hiwatt Bob]

more help needed!


so even the guys at Savage are a little perplexed.

basically, the same thing is wrong this time as last time. essentially, the 100 ohm resistor (that comes off of the high voltage power supply that then feeds the plate voltage on one side and feeds the screens on the other) was fried again. they replaced it again and it's working perfectly now (like it did before)--everything is performing the way they'd like to see it. but they are not sure what caused that to happen twice like that--so they want to hang on to it for a little while and see if they can get it to happen again, just to try to find out the root cause of it.

i told them i'd post here to get some opinions--maybe some experts here have experienced similar problems??

thanks bros-

[Stelle79]

more help needed!


so even the guys at Savage are a little perplexed.

basically, the same thing is wrong this time as last time. essentially, the 100 ohm resistor (that comes off of the high voltage power supply that then feeds the plate voltage on one side and feeds the screens on the other) was fried again. they replaced it again and it's working perfectly now (like it did before)--everything is performing the way they'd like to see it. but they are not sure what caused that to happen twice like that--so they want to hang on to it for a little while and see if they can get it to happen again, just to try to find out the root cause of it.

i told them i'd post here to get some opinions--maybe some experts here have experienced similar problems??

thanks bros-

Since it's the 100 Ohm 5W resistor, something is pulling more current after that resistor. This resistor feeds HT for the screens and pre-amp, so the problem should be located there I'm thinking. It' an intermittent problem and maybe temperature related? Did you use the same EL34's the second time? I'd clean the sockets just to be sure. It might be one of the caps in the preamp-rail or a preamp tube? I'm just thinking out loud...

[Hiwatt Bob]

they did put in a new set of Winged-C's, but i don't think those are the issue. they cleaned and retensioned all the tube sockets.

if it were a preamp tube--how would that cause that problem? could a preamp tube cause that resistor to fry? i know they tested my preamp tubes and some came back as borderline weak. i told them to skip replacing those, because i've got a bunker full of preamp tubes.

[mhuss]

Preamp tubes just never fail catastrophically. I don't think I've ever seen even one case. That leaves the output tubes and the filter caps. Did you ever replace the latter?

--mark (from lovely Columbus, IN )

[Hiwatt Bob]

Preamp tubes just never fail catastrophically. I don't think I've ever seen even one case. That leaves the output tubes and the filter caps. Did you ever replace the latter?

--mark (from lovely Columbus, IN )

i am not sure--do these look original:

[OldSchoolDave]

i am not sure--do these look original:

Just asked the good Dr.Hiwatt and he said Hylight didn't use LCR caps. Some Biacrowns did.

So, yours are probably replacents.

Dave

[Hiwatt Bob]

hmmm. any other thoughts?

greatly appreciate all the help--shouldn't you guys be conventioning in a couple hours?

[Dr.HI-TONE]

how about some gut shots? Maybe something will be evident?

[Hiwatt Bob]

not the best shots--these are all i have: