8150's - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 21st February 2011, 02:00 PM   #1
diyAudio Member
rsumperl's Avatar
Join Date: Oct 2009
Location: Cascade, Idaho
Default 8150's

Morning everyone,
So felt the need to test some 8150's in P-P. The 8150 was used in RF service for mobile equipment. I got 20 NOS Amperex for 50 cents each. I used 500v on the plate and 200v on G2. According to the datasheet G2 can go to 250v. I set idle current at 35ma/tube. I used a 6600 ohm load.
My setup is fairly simple, I feed an MP3 player into an interstage transformer.
Well, I am extremely pleased with the results. I can't tell you what the power out is nor can I tell you the distortion level, but what I can tell you is the sound is really, really clean. The bass seems really good too. I turned the MP3 player up as high as it would go. The ammeter was saying I was hitting peaks of 120ma. The sound was really good.


Attached Images
File Type: jpg 100_1434.JPG (555.4 KB, 93 views)
File Type: jpg 100_1433.jpg (600.4 KB, 112 views)
  Reply With Quote
Old 13th March 2011, 05:23 PM   #2
diyAudio Member
rsumperl's Avatar
Join Date: Oct 2009
Location: Cascade, Idaho
So, fed the 8150's with the driver board from a Dynaco Mark III. Real nice. So, at this point specifics are: Plate is 500v, Screen is 235v,
and Grid 1 is -35.8v for a 75ma idle(2 tubes). P2P load is 3.3K.
I am using the 8150's with 12v on the filaments. For the tube in the Dynaco driver board, I am using a 7258. The 7258 is a 12v version of the 6AN8.
Attached Images
File Type: jpg 100_1446.JPG (421.6 KB, 35 views)
File Type: jpg 100_1447.JPG (369.3 KB, 27 views)
File Type: jpg 100_1448.JPG (757.2 KB, 26 views)
File Type: jpg 100_1449.jpg (479.4 KB, 13 views)
File Type: jpg 100_1450.jpg (529.7 KB, 15 views)
File Type: jpg 100_1451.JPG (895.6 KB, 18 views)
  Reply With Quote


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
2 pairs of 8150's rsumperl Tubes / Valves 2 23rd February 2010 06:43 PM

New To Site? Need Help?

All times are GMT. The time now is 05:08 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2