Spinspin69 Posted March 5 Posted March 5 Just picked up this old dog. With a little work, I think she'll sound sweet. 13
mwhouston Posted March 5 Posted March 5 10 hours ago, Spinspin69 said: Just picked up this old dog. With a little work, I think she'll sound sweet. 100W? 1
mwhouston Posted March 5 Posted March 5 10 hours ago, Spinspin69 said: Just picked up this old dog. With a little work, I think she'll sound sweet. Lets see if you are still smiling after a total tube replacement?
Spinspin69 Posted March 5 Posted March 5 4 minutes ago, mwhouston said: 100W? 75w p/c in pentode, 35w in triode 1
Spinspin69 Posted March 5 Posted March 5 3 minutes ago, mwhouston said: Lets see if you are still smiling after a total tube replacement? I'm crying just thinking about it... but i love the GL KT77's - have them in the amp that this replaced. 1
mwhouston Posted March 6 Posted March 6 A local guy who just bought my “Aspire” 6SN7 preamp claims the 6C33C is no longer being manufactured. He has an amp which takes them and has asked if he can buy a few of mine. I have six only need four for future amp. Happy to sell. I think when I bought mine many years ago they were $20 each. Looks like they have gone up a little. 1
aussievintage Posted March 6 Posted March 6 19 minutes ago, mwhouston said: A local guy who just bought my “Aspire” 6SN7 preamp claims the 6C33C is no longer being manufactured. They are in stock all over the place. https://www.tubeampdoctor.com/en/6c33c-b/6s33s-v-triode-nos https://www.thevalvestore.com.au/home/84-6c33c.html 1
Silver Audiophile Posted March 15 Posted March 15 30 minutes ago, xlr8or said: My preamp is up and running. Sounds devine. Surely the gent with the finest choice collection of tubes and possibly tube gear on this planet! 2 1
Spinspin69 Posted March 15 Posted March 15 9 hours ago, xlr8or said: My preamp is up and running. Sounds devine. Tube heaven... 2
Martykt Posted March 15 Posted March 15 10 hours ago, xlr8or said: My preamp is up and running. Sounds devine. This looks really interesting. Apologies if I've missed any of your previous posts, I'm curious to know more about it? 2
Silver Audiophile Posted March 16 Posted March 16 12 hours ago, xlr8or said: My preamp is up and running. Sounds devine. Lovely, Kirk. That pre amp had circuit related issues when you got it, how did you rectify it? 1
PKay Posted March 16 Posted March 16 My new amp. I know absolutely nothing about them so any pointer to a manual would be greatly appreciated. 4
Bisguittin Posted March 16 Posted March 16 Certainly true. Kirk's collection is unmatched. Just out of interest @xlr8or, what sort of music do you listen to with these wonderous devices? 4
mwhouston Posted March 16 Posted March 16 2 hours ago, Spinspin69 said: Tube heaven... 12 hours ago, xlr8or said: My preamp is up and running. Sounds devine. Why a 6C5? I see it is just a general triode. Is there something special about it?
xlr8or Posted March 16 Posted March 16 1 hour ago, Martykt said: This looks really interesting. Apologies if I've missed any of your previous posts, I'm curious to know more about it? The preamp came with 6C5, 227 and 80 tubes. The 227 tube had its heater wired in series of a 6.3v secondary - mods are the white cloth cable additions. I changed the heater to be parallel and used 76 tubes instead, which is the successor tube to the 227 tube. I intend to go back to the 227 tube when I have a bit more time to replace the PT with my Sansui one that arrived a few weeks ago from Japan. It has dedicated 2.5v taps. 6
mwhouston Posted March 16 Posted March 16 2 minutes ago, mwhouston said: Why a 6C5? I see it is just a general triode. Is there something special about it? Not overly pricey.
xlr8or Posted March 16 Posted March 16 15 minutes ago, Silver Audiophile said: Lovely, Kirk. That pre amp had circuit related issues when you got it, how did you rectify it? I fixed all of them with the exception of the RCA ground lift needed to remove the hum. Will get some Tamura 600:600 ohm iron to nullify the return path. 4
xlr8or Posted March 16 Posted March 16 5 minutes ago, mwhouston said: Why a 6C5? I see it is just a general triode. Is there something special about it? That it is, but that's only the input stage. The magic is in the next stage. I don't look at price as being a precursor for purchasing my gear. If you need to know that preamp cost me a measly $500 all up door to door from Japan. Had that a Shindo label on the front with new green hammertone powder coating finish and a buffed polished look, I'd say the multiplier would be 100x more. 4
xlr8or Posted March 16 Posted March 16 23 minutes ago, PKay said: My new amp. I know absolutely nothing about them so any pointer to a manual would be greatly appreciated. It looks to be a Bottlehead 2A3 amp with I assume a 12AX7/AU7 input stage? The OPTs would typically be a 2.5kohm primary impedance load. Some nice caps and audio chokes have been used inside. It looks to be cathode biased. At a guess, the pots would be for volume and hum control for the heaters. The stepped pot would be a selector switch. 4
mwhouston Posted March 16 Posted March 16 11 minutes ago, xlr8or said: That it is, but that's only the input stage. The magic is in the next stage. I don't look at price as being a precursor for purchasing my gear. If you need to know that preamp cost me a measly $500 all up door to door from Japan. Had that a Shindo label on the front with new green hammertone powder coating finish and a buffed polished look, I'd say the multiplier would be 100x more. Wasn’t enquiring on amp cost but thanks, just checking availability of that tube and its cost. Im enjoying my metal tube 6N7 in a preamp of late but in situ at the mo. is Russian 6H3N-EB in two stage white follower (currently for sale). Cheap as dirt new tubes, very clear, quiet and detailed. Shows you don’t need to spend big time to get a big sound. http://retro-thermionic.blogspot.com/2022/11/mirage-6h3n-eb-preamp.html
xlr8or Posted March 16 Posted March 16 1 minute ago, mwhouston said: Wasn’t enquiring on amp cost but thanks, just checking availability of that tube and its cost. Im enjoying my metal tube 6N7 in a preamp of late but in situ at the mo. is Russian 6H3N-EB in two stage white follower (currently for sale). Cheap as dirt new tubes, very clear, quiet and detailed. Shows you don’t need to spend big time to get a big sound. http://retro-thermionic.blogspot.com/2022/11/mirage-6h3n-eb-preamp.html There are many, many tube types that can still be found at cheap pricing. The problem is in sourcing the circuit diagrams that use them. If you are prepared to research Japanese literature, you'll find the most extensive range of tube circuit diagrams available in existence. Did you know that MJ magazine still publishes 3-4 tube circuit diagrams every month since the 1960's. The only main challenge is in translation. 4
mwhouston Posted March 16 Posted March 16 8 minutes ago, xlr8or said: There are many, many tube types that can still be found at cheap pricing. The problem is in sourcing the circuit diagrams that use them. If you are prepared to research Japanese literature, you'll find the most extensive range of tube circuit diagrams available in existence. Did you know that MJ magazine still publishes 3-4 tube circuit diagrams every month since the 1960's. The only main challenge is in translation. MJ Magazine?
PKay Posted March 16 Posted March 16 28 minutes ago, xlr8or said: It looks to be a Bottlehead 2A3 amp with I assume a 12AX7/AU7 input stage? The OPTs would typically be a 2.5kohm primary impedance load. Some nice caps and audio chokes have been used inside. It looks to be cathode biased. At a guess, the pots would be for volume and hum control for the heaters. The stepped pot would be a selector switch. Thanks, I’m not sure which model it is so I can’t find a manual. Also not sure what the middle valve is. 1
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