Tubelab Simple P-P - Page 36 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 2nd May 2011, 04:46 PM   #351
wagtail is offline wagtail  Ireland
diyAudio Member
 
wagtail's Avatar
 
Join Date: Aug 2010
Location: Kerry
hi guys,
finished my SPP build , after sorting a couple of small problems caused entirely by my inexperience, it is now driving my Alpair 7 FH3s and sounds great.

i got 4 DVMs with mini-grabbers from e-bay @ $3 each inc.postage ! would not have dreamed of buying these if not for Tubelab meters page, thanks george, so i now have 5 DVMs and what i really need is a 'checkout Spp for dummies' as per Ty-Bower's SSE guide.
simon
  Reply With Quote
Old 10th May 2011, 06:38 PM   #352
netbug is offline netbug  United States
diyAudio Member
 
Join Date: May 2009
Location: roseville, ca
Is the simple PP checkout and setup page broken? I'm looking for the wiring diagram for the OPTs.

Checkout
  Reply With Quote
Old 11th May 2011, 07:52 AM   #353
Ian444 is offline Ian444  Australia
diyAudio Member
 
Join Date: Nov 2008
Location: Brisbane QLD
This might help, if its what you are looking for:

http://i198.photobucket.com/albums/a...hemPentode.gif

http://i198.photobucket.com/albums/a...ePPschemUL.gif

The green dots represent the terminal blocks, and are labeled the same as the PCB.
One schematic is for pentode mode, the other is for ultralinear.

Last edited by Ian444; 11th May 2011 at 07:55 AM.
  Reply With Quote
Old 11th May 2011, 06:02 PM   #354
wagtail is offline wagtail  Ireland
diyAudio Member
 
wagtail's Avatar
 
Join Date: Aug 2010
Location: Kerry
hi guuys,
here are my measurements, do they look ok? pt is hammond 372JX.
EL84's (averaged)
p3 cathode 11.7vdc
p7 plate 331.5vdc
p9 screen 329.5vdc

GZ34 pin8 373vdc
C1 361vdc
R2 357vdc

i'm going to check the 12at7's again i don't understand the readings i got
v100 p8 .001 vdc, p6 110vdc
v200 p3 110vdc, p1 207vdc
simon
  Reply With Quote
Old 11th May 2011, 06:41 PM   #355
netbug is offline netbug  United States
diyAudio Member
 
Join Date: May 2009
Location: roseville, ca
Quote:
Originally Posted by Ian444 View Post
This might help, if its what you are looking for:
Perfect! Thank you very much. I could figure out UL from the OPT specs and the amp schematic, but I was not sure how to setup Pentode mode.

So a 4PDT switch would allow changing modes (while off)?
  Reply With Quote
Old 12th May 2011, 07:20 AM   #356
Ian444 is offline Ian444  Australia
diyAudio Member
 
Join Date: Nov 2008
Location: Brisbane QLD
A 4PDT switch should work. I would be very interested to hear a report on the two different modes
  Reply With Quote
Old 12th May 2011, 07:42 AM   #357
Ian444 is offline Ian444  Australia
diyAudio Member
 
Join Date: Nov 2008
Location: Brisbane QLD
Simon, the 12AT7 voltages look good except for pin 8 which should be around 0.8V or so.
Probably just a measuring mistake, maybe the probe was not making good contact, since the amp works.
The GZ34 pin 8 should be the same as C1, which is connected to C2 by R1. So one side of R1 is the C1 voltage and the other side of R1 is the C2 voltage which is the B+ fed to the output transformer. But since you have 331V on the EL84 plates, which is 320V across the tube, then I would say all is well, as long as your EL84's are not red-plating. If you are using JJ EL84's it should be fine.

Last edited by Ian444; 12th May 2011 at 07:44 AM.
  Reply With Quote
Old 12th May 2011, 11:49 AM   #358
wagtail is offline wagtail  Ireland
diyAudio Member
 
wagtail's Avatar
 
Join Date: Aug 2010
Location: Kerry
Thanks Ian, i am chuffed iv'e got this far (Triumphs, Nortons and BSA's i understand)
will re-check pin 8, i swapped the valves around and i think i did get a higher voltage but by then one of the meters was acting up and i got distracted.
the voltages were taken across C1 and R2 which should account for the lower readings,
no sign of red-plating so far, they are Sovtek EL34's.
Simon
  Reply With Quote
Old 25th May 2011, 06:09 PM   #359
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Default Psvane tube set

I thought it would be time for an update on my impressions of the complete Psvane tube set installed in my SimplePP about 6 weeks ago. Silly pricing aside (well maybe not so silly compared to NOS Blackburn Mullards, etc), these easily outperform the JJ EL84s and Sylvania 12AT they replaced, in all regards.

Similarly, the Shuguang Treasure 6CA7 out finessed./ detailed a well aged set of SED EL34s in a custom built triode connected SE amp. (Raytheon 5842 driver)

Normally I'd be a bit less spendy on tubes, but my wife granted me a healthy allowance after a very protracted home reno project ( over 2 years this current go-round). The sales tax on the installation of bathroom/fireplace tiles was more than the total cost of the tubes. Now, what can I barter for a pair of Hashimoto or Electra-print OPTs? .....

I mean, a guy can't really have too many amps, as long as they're not all on visible at the same time
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 25th May 2011, 06:15 PM   #360
zman01 is offline zman01  Bangladesh
diyAudio Member
 
Join Date: Feb 2011
Location: Dhaka
Quote:
Originally Posted by chrisb View Post
I mean, a guy can't really have too many amps, as long as they're not all on visible at the same time
+1 Chrisb, well said!

Amps are easier on space vs speakers... and don't they just look great with the glowing tubes? It's like science and art at play at the same time!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Electrolyticless Tubelab Simple SE nic6paul Tubelab 26 20th August 2013 12:56 PM
Second Tubelab Simple SE board done budmaestro Tubes / Valves 0 24th July 2008 12:18 AM
First Project Finished-Tubelab Simple SE waam68 Tubes / Valves 2 12th April 2008 06:23 AM
Tubelab Simple SE & Edcor waam68 Tubes / Valves 2 6th March 2008 12:15 PM
New SET: JE labs simple 45 or tubelab SE? cwujek Tubes / Valves 14 27th November 2007 04:15 AM


New To Site? Need Help?

All times are GMT. The time now is 11:24 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2