Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

Solid State Rectifier in Dynaco Tube Amp
Solid State Rectifier in Dynaco Tube Amp
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 7th January 2014, 03:42 PM   #11
jazbo8 is offline jazbo8
diyAudio Moderator
 
jazbo8's Avatar
 
Join Date: Jan 2011
Location: In Transient
Solid State Rectifier in Dynaco Tube Amp
Quote:
Originally Posted by indianajo View Post
This whole discussion is *****-****. Bob Latino doesn't make or sell Dynaco amplifiers. The ST120 is a transistor amplifier. I own one. I also own a ST-70 Dynaco tube amp. Change the title of the thread or delete yourself, IMHO.
Bob Latino makes and sells Dynaco clones and uses the confusing "VTA ST-120" model name for his version of the beef-up Dynaco ST-70. This is the amp that the OP bought and are having trouble with.
  Reply With Quote
Old 7th January 2014, 04:52 PM   #12
20to20 is offline 20to20  United States
diyAudio Member
 
Join Date: Jun 2010
Quote:
Originally Posted by jazbo8 View Post
Bob Latino makes and sells Dynaco clones and uses the confusing "VTA ST-120" model name for his version of the beef-up Dynaco ST-70. This is the amp that the OP bought and are having trouble with.
There is nothing Dynaco cloned in that amp.

There is way too much Dynaco name "coopting" in the cottage industry of DIY Dynaco aftermarket.

Putting a different circuit on a similar designed steel box (he says his box is better engineered) doesn't give anyone the right to brand themselves "Dynaco." There are plenty of newbies who don't know what's, what. They just want a piece of the fun, and will buy into the fog of the hobby and keep the misnomers propogated.

20

Last edited by 20to20; 7th January 2014 at 04:56 PM.
  Reply With Quote
Old 7th January 2014, 07:50 PM   #13
Matt BH is offline Matt BH  United Kingdom
diyAudio Member
 
Join Date: Jul 2009
Location: Cheltenham
If the OP's amp is indeed a Bob Latino one and it is wired the same as these:

Bob Latino Dynaco Tube amps

Scroll down for the pics.

I would strongly suggest fitting 3 wire mains lead. Also the other two howlers are pretty obvious. The mains switch and fuse!! These should both be in the live conductor preferably fuse first and if possible a double pole switch.

Shocking!!!!!!

Cheers
Matt.
  Reply With Quote
Old 7th January 2014, 10:04 PM   #14
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Maybunga, Pasig City
Solid State Rectifier in Dynaco Tube Amp
Frank Van Alstine and Dave Curcio are two guys modding the Dynaco ST70 and have been using the Dynaco trademark, are there legal impediments to this?
__________________
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
  Reply With Quote
Old 7th January 2014, 10:09 PM   #15
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Solid State Rectifier in Dynaco Tube Amp
Not that I can see (though IANAL)- their stuff is for actual Dynaco amps. It's like selling aftermarket mufflers or modified camshafts for Fords.
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 7th January 2014, 10:12 PM   #16
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Maybunga, Pasig City
Solid State Rectifier in Dynaco Tube Amp
Thanks SY, how about Bob Latino selling clones?
__________________
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
  Reply With Quote
Old 7th January 2014, 10:53 PM   #17
SY is offline SY  United States
On Hiatus
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Solid State Rectifier in Dynaco Tube Amp
Dunno, never seen his ads.
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
  Reply With Quote
Old 15th March 2019, 03:55 AM   #18
engel dela pena is offline engel dela pena  Philippines
diyAudio Member
 
Join Date: Oct 2005
Quote:
Originally Posted by TonyTecson View Post
a lamp limiter is best to use if you plug in that rectifier, just so you have peace of mind....

another thing i do is to add two 27 ohm to 47 ohm 5 watt resistors in series with the hv windings going to the plate of the rectifiers, you lose B+ this way...
here 100R 5 watts,........kuya
Poor man's solid state replacement rectifier for Dynaco ST-70, Mark II, Mark III or Mark IV
  Reply With Quote
Old 15th March 2019, 10:05 PM   #19
ejp is offline ejp  Australia
diyAudio Member
 
Join Date: Mar 2007
Location: Melbourne, Victoria
Quote:
Originally Posted by jazbo8 View Post
Mr. Latino's comment on the same thread, seems to indicate that the capacitors in the ST-120 should be able to handle it, no idea if the bias needs to be adjusted...
I can't see where he mentioned capacitors at all, but as his mod reduces B+ by ~0.5V there is no apparent reason why the PSU capacitors shouldn't handle it, or the bias should need adjustment either.

Again, this mod is not a rectifier replacement by SS, it just the addition of series SS diodes, apparently to protect valve rectifiers that don't meet their PIV specification. My solution would be to use a rectifier that is within spec.
  Reply With Quote
Old 16th March 2019, 03:25 AM   #20
Rady is offline Rady  United States
diyAudio Member
 
Join Date: Jul 2006
Location: Dallas
First: using SS rectifier will increase power dissipate over output tubes; means shorter life of output tubes.
Second: installing resistors in series with SS rectifiers will sag voltage exactly as tube rectifier does. So, installing SS rectifier is not good. You can use different power transformer or use tube rectifier. Or use a variac to reduce ac input voltage.
  Reply With Quote

Reply


Solid State Rectifier in Dynaco Tube AmpHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
difference between rectifier and solid state rectifier plig88 Solid State 5 15th March 2013 06:28 AM
Solid state rectifier for SE guitar amp (Vox AC4) ddr Power Supplies 6 4th June 2010 01:09 PM
Dynaco solid state manuals available for download Bob01605 Solid State 2 31st December 2009 12:52 AM
converting tube rectifier to solid state rectifier. tubo Tubes / Valves 26 24th December 2009 12:12 AM
Tube rectifier to Solid state Diodes exchange finwbu Tubes / Valves 2 20th July 2007 05:41 AM


New To Site? Need Help?

All times are GMT. The time now is 02:08 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki