Not sure about the bypass loop one but the right one is for switching between triode-connected and UL-connected for the output tubes. Don't know about this amp specifically but generally the amp must be off when making that switch. Triode will be less power (~10W/ch?) than UL (~20W/ch?) but they will have somewhat different sonic signatures.Trying to figure out what these switches are for?
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Those are all good tubes, assuming they are not worn out. I wouldn't look to change them out for anything unless there's a problem.View attachment 1028921 View attachment 1028922 View attachment 1028923
I'm trying to figure out if there are good tubes? what size?
- 8 x EL84 Russian NOS EL84M
- 2 x 6414 RAYTHEON
- 2 x 12AT7EH Siemens
I'm surprised the power ratings are as high as they claim, 20W is lofty for a pair of pentode- connected EL84s, 40 from PPP UL sure seems like a lot. Looking forward to hearing impressions.
Manley always claims that they don't run their tube amps hard, either.I'm surprised the power ratings are as high as they claim, 20W is lofty for a pair of pentode- connected EL84s, 40 from PPP UL sure seems like a lot. Looking forward to hearing impressions.
There are 8x power tubes, 4x for each channel. They are Pentodes running in either Ultra Linear or in Pseudo Triode mode. Those are the choices available with the Stingray.
Maximum Output Power UL mode: 40 Watts x 2 channels 1.5% THD @ 1kHz
Maximum Output Power TRIODE mode: 20 Watts x 2 channels
Well, i guess is shows there is more to consider regarding design.Yes, but typically PP EL84 will make about 6W in triode and about 12W in UL so I was expecting more like double those numbers in PPP, but maybe this goes a bit deeper in AB to get some more power.
Very interesting.Listen to both carefully , and decide what you like the most listen to music you a very familiar with . Horns and Directly heated cathode tube like in the Moth 45 usually sound the best .
I have been using 6BQ5 amps the last 4 month after not having my system working for a year , and just put my 6B4g ( A 6 volt 2A3)amp back end and wondered why i was depriving myself .
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