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Old 9th March 2013, 03:37 PM   #1
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Default 50 Type Tube

Anyone here use or heard these tubes, I am told they rival the 45 type tube but with more power???
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Old 9th March 2013, 06:16 PM   #2
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Interesting topic. I thought about a 50 amplifier as well. The new production SG50 is a really fine tube ans just round ~50$ (Shuguang SG-50 new Hi-Fi vacuum tube)

Problem is...sadly...the max. grid resistor is only 10k. So forget about about a nice old globe triode driving it directly. Either interstage or Cathode/Source/Emitter follower (=Power Drive).
A good high-gm pentode, a mosfet and a 50. All directly coupled. Would yield a nice, unusual amplifier. Far away from the mainstream "Sakuma Style".
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Old 9th March 2013, 06:39 PM   #3
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Thought I would share this with you since you were kind enough to reply.
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File Type: jpg Proto Type 50 Amp 002.jpg (866.7 KB, 668 views)
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Old 9th March 2013, 08:50 PM   #4
vega65 is offline vega65  Norway
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Jcmusic
I have started to plan a 50 se these days
can you share some info about your setup?

Best regards
Vegard
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Old 10th March 2013, 08:08 AM   #5
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Here is one of my 50 Monoblocks.
Best 3 watts I've ever heard in my system.
U52 Gold Lion rectifier, Ecc32 Driver, RCA 50 (large foil getters)

Click the image to open in full size.
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Old 5th April 2014, 12:00 AM   #6
vudr is offline vudr  Viet Nam
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Hi,

Can you share the schematic for your 50 type tube monobloc.

Tkx,
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Old 5th April 2014, 01:15 AM   #7
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From what I understand, the types 45 and 50 present music rather differently. To generalise at a very gross level: 45 = direct yet natural; 50 = tone monster yet natural.

Both are relatively easy to drive, if you can supply the voltage. NOS 50s have significant constraints regarding the amplifier's grid circuitry (max grid resistor 10k, transformer or grid choke coupling), but new production do not have this issue. Frankly, I'd not bother with unreliable and expensive NOS 50s when new tubes do not have the grid circuitry constraints, Shuggies are available for cheap and EML does a reportedly very nice (nicest?) 50 for about the same cost as the NOS.

I'd like to try a 50 someday.
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Last edited by rcdaniel; 5th April 2014 at 01:20 AM.
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Old 5th April 2014, 11:13 AM   #8
mobyd is offline mobyd  New Zealand
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Quote:
Originally Posted by jcmusic View Post
Thought I would share this with you since you were kind enough to reply.
I take it you don't have any cats
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Old 6th April 2014, 05:33 AM   #9
WBS is offline WBS  Tibet
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Quote:
Originally Posted by gamve View Post
Here is one of my 50 Monoblocks.
Best 3 watts I've ever heard in my system.
U52 Gold Lion rectifier, Ecc32 Driver, RCA 50 (large foil getters)

Click the image to open in full size.
Where did you get those double C-core transformers?
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Old 6th April 2014, 12:19 PM   #10
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The problem with Shuguang SG50 is quality control. I bought 2 pairs and found one of them had bad filament after 50-60 hours of usage. Another pair has been good for many years (4 already), however.

I've never compared with old 50 but it sounds really good to me. I use 5K opt which I can switch between 50 and 300B. I like them both.
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