Tube Amps / Music Electronics
|For current discussions, please visit Music Electronics Forum.||New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!
|Listen to great tunes streaming live right now!|
|previous: DavidB Hey Ray,||View Thread|
|12/29/2004 1:35 PM|
|Ray Ivers||Re: tube problem?|
Can't complain - although right now I'm doing parts inventory so maybe I can.
My Valve Arts KT66's read open-circuit cold, but I've read somewhere that 200K ohms with heaters up to full temperature was sort of the unofficial 'break point' between definitely-good and kinda-iffy. With 100R resistors routinely connected from the heater winding to ground 200K seems like a pretty high standard for the heater insulation to a grounded cathode, no? OTOH I would definitely prefer infinite H-K resistance to a first preamp stage's unbypassed cathode resistor...
If you read 50R H-K obviously that's not good but I bet you won't see anything close to that. If the cathode ground connection didn't let go you shouldn't have gotten any arcing either, but it's always a good idea to check IMO. If you had a cathode-biased amp that might be a different story, and with a fused cathode w/blown fuse I would be amazed if you had no arcing or H-K burn-through.
|DavidB Hey Ray,|