Car Tube Amp? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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
Reply
 
Thread Tools Search this Thread
Old 10th June 2008, 06:46 AM   #1
Zap is offline Zap  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Milwaukee, WI
Default Car Tube Amp?

I'm curious if anyone on the forum has firsthand experience with 12V tubes or a design for a mobile tube amp?

I've been pondering this idea ever since finishing my Simple SE and being addicted to its sweet sound. What makes it particularly convenient is all the wiring is already present in the car to make this much easier, since it has a premium factory system with JBL speakers AND is bi-amped. I believe that the amp is rated at 15W RMS, and the subwoofer amp 85W RMS. Unfortunately, I do not have data on SPL / efficiency of the speakers.

So I have power, signal, and speaker wires in one convenient place. I could buy a set of factory amp bypass cables to allow the tube amps to basically plug in. I will have to verify, but I believe the speakers are 6 ohm, but that would just change the OPT design to pick.

What I'm thinking....

- The little edcors should probably work nicely given the lack of need for low bass amplification
- The solid state amp can remain and power the sub
- Amp will be in the trunk, with a proper cover to prevent impact
- I want this to be SE, both for audio and the number of tubes and other parts to make it PP would be prohibitive.

What I don't know....
- What sort of tubes were used in common car stereos, due to rugged construction and obvious limits on power supply design (or other tubes that would work well, also). Guessing NOS is the only way to go here.
- Can I get enough power from the electrical system to run 4 tubes with a 10-15W UL output? The alternator is good for 130A....more than a number of cars, so that might help...
- Do I need a custom P/S or transformer for the HV?

So, with that said... please bash / encourage away as you see fit. I'd like honest feedback about this idea
  Reply With Quote
Old 10th June 2008, 07:09 AM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: nowhere
You can use one of the SS car amplifiers you've got to power the powersupply for the tube amp. A wien bridge low distortion oscillator can drive the SS amp, which in turn drives a step up transformer. A reverse connected line tranny of appropriate rating should work. Now you have high voltage and can use any tube you want.
  Reply With Quote
Old 10th June 2008, 07:28 AM   #3
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
Hi,

Want serious "boom car" tube power?
http://w5jgv.com/hv-ps1/index.htm

We did one too, turned into one of the longest threads in GeeK ZonE history
http://geek.scorpiorising.ca/GeeK_Zo...p?topic=1092.0

Cheers!
  Reply With Quote
Old 10th June 2008, 12:27 PM   #4
diyAudio Member
 
diegot's Avatar
 
Join Date: Sep 2004
Location: Brazil
I want to build one in the future.
You can mod a car PS to give you the high voltages or construct your own.
I'm saving some 7C5 for this amp. They are loctal 6V6 and where used in car radios.
I want to use the unity coupled topology, as McIntosh use, getting high power with low idle current, but the OPT are the problem as they are not ready for purchase.

Diego
  Reply With Quote
Old 10th June 2008, 04:07 PM   #5
diyAudio Member
 
Join Date: Jul 2006
I've posted to this effect before, but there are tubes designed specifically for this purpose. I'm thinking the 6GM8, which is intended for low-B+ operation in the range of 24V. I haven't heard one personally, and I only have a rough idea of how linear it is at these low voltages, but it seems pretty popular of late.

Obviously, this doesn't fit the needs of an output stage (being a signal tube), but you may have good results driving a more car-friendly SS power amp with it. That'd absolve you of having to generate more traditional B+ voltages from a 12V source.

--k
  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
need diy tube preamp (line-stage) recommendation and general tube advice Musiclover4 Tubes / Valves 16 18th May 2013 03:19 PM
FS tube tuner, Active filter kit, tube amp, amp3 Josephjcole Swap Meet 9 20th July 2007 04:05 PM
SS or tube voltage amplifying stages in an amp with tube output? ray_moth Tubes / Valves 14 4th July 2007 03:09 AM
tube driving the same tube - whats the collective word? zobsky Tubes / Valves 3 13th June 2005 06:47 AM


New To Site? Need Help?

All times are GMT. The time now is 04:19 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