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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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Old 14th August 2011, 11:53 AM   #3591
mindutis is offline mindutis  Sweden
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And dont forget a very helpful tool for turning on and off...

Click the image to open in full size.
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Old 14th August 2011, 02:22 PM   #3592
mikkokam is offline mikkokam  Finland
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Mindutis: yes. Switches requiring brute tactile force make them feel solid. :-)

Update about the bias: the Shuguangs were running at an OK level from the factory. The plate voltage was 401 V and the cathode currents were L: 52 mA and R: 53 mA - giving a a value of > 21 W which seemed high to me but the specs claim a max 30 W for Shuguangs - so it was exactly 70%. Tested a lower level and adjusted both to 40 mA giving a 412 V and thus 16.5 W. Seems enough for me (sound is the same) and maybe get a better life for the tubes?
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Old 14th August 2011, 03:34 PM   #3593
Cassiel is offline Cassiel  Libya
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DIY Tube amp and matching speakers
I love it!
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Old 19th August 2011, 03:36 AM   #3594
VictoriaGuy is offline VictoriaGuy  Canada
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Default Poddwatt

A recent build of Bruce Heran's Poddwatt......

6N1P drivers, EL84 (6P14P-EV) outputs.
Heath SA-2 OTs.
Power transformer was something I had on the shelf, but was a bit small, so I added a filament transformer.

Cherry knob and end plates.
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File Type: jpg poddwatt_2.jpg (31.0 KB, 1453 views)
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Old 19th August 2011, 03:43 AM   #3595
VictoriaGuy is offline VictoriaGuy  Canada
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Default RH84 from RCA Victor console

Console pull was a Canadian RCA Victor with a voltage doubler power supply. Initially I thought I would be able to use the old can caps, but the hum level was too high, so I stacked some new caps under the deck. I left the smaller cans in place, disconnected.

The chassis wasn't really suitable for leaving exposed, so I built a wooden case - open backed.
Box is finger-jointed black cherry with spalted arbutus sawn veneer faceplate.

The chassis is raised about 1/4 inch so that there is good air flow via the bottom gap and the numerous perforations in the chassis top.
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File Type: jpg case_1.jpg (37.8 KB, 1443 views)
File Type: jpg case_2.jpg (29.2 KB, 1442 views)
File Type: jpg under_1.jpg (50.6 KB, 487 views)
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Old 19th August 2011, 03:48 AM   #3596
mhouston is offline mhouston  Australia
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Quote:
Originally Posted by VictoriaGuy View Post
A recent build of Bruce Heran's Poddwatt......

6N1P drivers, EL84 (6P14P-EV) outputs.
Heath SA-2 OTs.
Power transformer was something I had on the shelf, but was a bit small, so I added a filament transformer.

Cherry knob and end plates.
Good work. I like the bit of timber.
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Old 19th August 2011, 03:52 AM   #3597
VictoriaGuy is offline VictoriaGuy  Canada
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Default RH84 from Chisholm console

Console pull - made in Port Moody,BC by Chisholm.

The IEC power entry fit (with some work) into the hole left by the octal socket which communicated with the tuner & control panel in the console.
I used the original tube sockets which were fairly good quality. Desoldering the (very well-done) original construction was a bit of work. Usually the final lug on the tube socket is the one that breaks. Either my technique is improving or I'm getting lucky: this time everything survived.

End plates are curly arbutus.
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File Type: jpg under_1.jpg (46.9 KB, 445 views)
File Type: jpg top_1.jpg (39.6 KB, 414 views)
File Type: jpg top_2.jpg (46.5 KB, 422 views)
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Old 19th August 2011, 11:32 AM   #3598
Bas Horneman is offline Bas Horneman  Netherlands
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Quote:
A recent build of Bruce Heran's Poddwatt......
How do you like that soundwize?
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If you can see the speaker cone move...it's not hifi.
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Old 19th August 2011, 07:28 PM   #3599
VictoriaGuy is offline VictoriaGuy  Canada
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Quote:
Originally Posted by Bas Horneman View Post
How do you like that soundwize?
It sounds good, but in retrospect seems a lot of work for the modest power output it develops (~2 watts). I need to get some more measurements to try to figure out why my build isn't developing more power.
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Old 21st August 2011, 04:49 PM   #3600
lenamit is offline lenamit
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Default 807 SE

I am a new member, this is done I just Monoblock, PSU, OPT, chassis
Diy at home.
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File Type: jpg CIMG4737.JPG (143.4 KB, 685 views)
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