#3801
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#3802
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FWIW a KT77 on my 6000a is the same as a 6CA7
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#3803
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Thanks. I did the same and seem to have gotten reliable readings. Interesting the bias and English settings are the same for the 600a and 6000a. Dial settings are different. |
#3804
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Hi, I need help. Last August I purchased a new LP27a preamp (uses either 65 or 27 tubes, 6BX7, and 80 rectifier). I'm getting an increasingly annoying hum with this preamp. It sounds like a ground loop? I have swapped out the 80 tube several times and tried different 27 and 56 tubes to no avail. I tested the 6BX7 tube and it tests strong.
The hum will occur just turning on the preamp and connected to my amp with no inputs into the pre. I have several tube, solid state and hybrid amps, and they all hum. Currently, I stopped using this preamp. Does anyone have any suggestions on how I can trouble shoot? Any suggestions as appreciated, thanks. |
#3805
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I also recommend contacting Dennis. I like to have an excuse to contact him. He is always so enjoyable to converse with. Planning a visit with him next week as a matter of fact. |
#3806
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I have emailed Dennis several days ago, but no reply yet.
What do you recommend for cleaning the sockets and pins? Thanks for the tip. |
#3807
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#3808
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Someone in this forum suggested to use a simple plug-and-play, inexpensive filtering gadget to improve the Amp's performance and allow better bass (please identify yourself, so we can give you credit) ... Well, I tried this gadget today and I'm so impressed I will never go back to the original setup.
With the RED MOD High-Pass filters at 100 Hz (the gadget), the Amp works without the overload of those difficult first 100 Hz frequencies. Passing those exclusively to the SUB (set with a line cross-over at 100Hz), bass lines are seamlessly connected between under and over 100 Hz (there is a tangible difference between reinforcing the bass and complementing it), and the Amp's performance has improved noticiably. I have so far only tried this with PRE and AMP running GL KT-77's, which used to be somewhat bass-limited in my rig. Not anymore! This setup has been my favorite for a while, and now it is gorgeous! I cannot imagine what this will do with tubes specified at lower max plate current in Triode at 250 V, i.e., EL-34, 6P3S-E (6L6), 350B and 6V6's. The cited smaller tubes (except the EL34, which I have never tried) struggle with body of sound in my system, essentially due to their limited electrical capacity, while having to deal with the highly demanding low frequencies ... Although I have yet to confirm this with smaller tubes, I bet now I'll be able to enjoy them much more. Anyone in possession of one or more SUB's must give these a try, they really work. Last edited by Musica Amantem; 06-11-2017 at 01:25 AM. |
#3809
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Let us know if 6V6's still sound anemic. Now you have me considering a subwoofer. MA the Enabler.
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#3810
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I also have the RedMod installed but never a/b'd them so cannot attest to their effects. |
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