Bridging question

PassFan · 4th June 2002, 07:12 PM

Is it possible to bridge a tube amp? If so, what are some of the things to be concerned about? Is it the same as a solid state amp. Thanks for the help

Thatch_Ear · 5th June 2002, 04:05 AM

To bridge a Dyna ST70 you put it in mono, jump the 16 ohm outputs and use the 8 ohm if I remember correctly. I was told that it is not recommended for long term use. It was years ago so get another opinion if this is the amp in question. But the answer is yes. You can bridge a tube amp. I remember getting a bit more power but no real improvement with performance so I took it back to stereo. You want a high wattage tube amp keep your eyes open for the Bogens that have 100 watts on ebay. Mono blocks, $400 might get you a pair but $500 is more likely.

Aud_Mot · 5th June 2002, 05:04 AM

PassFan,

I assume you want to bridge 2 stereo a tube amps with output transformers.

I have been told that differences from one transformer sample to the next can vary a great deal. One Xformer has a peak here, the other one has a valley there. This summing makes for a poor total.

The older the transformer, the greater the tolerences between units. This is especially true with the Dynaco transformers Thatch_Ear mentions.

If you have 2 identical stereo amps you wish to use, maybe a bi-amp situation could be of useful?

Just a suggestion.

Aud_Mot

4th June 2002, 07:12 PM	#1
PassFan diyAudio Member Join Date: Aug 2001 Location: Central FL	Bridging question Is it possible to bridge a tube amp? If so, what are some of the things to be concerned about? Is it the same as a solid state amp. Thanks for the help

5th June 2002, 04:05 AM	#2
Thatch_Ear diyAudio Member Join Date: Nov 2001 Location: Dallas,Tx	To bridge a Dyna ST70 you put it in mono, jump the 16 ohm outputs and use the 8 ohm if I remember correctly. I was told that it is not recommended for long term use. It was years ago so get another opinion if this is the amp in question. But the answer is yes. You can bridge a tube amp. I remember getting a bit more power but no real improvement with performance so I took it back to stereo. You want a high wattage tube amp keep your eyes open for the Bogens that have 100 watts on ebay. Mono blocks, $400 might get you a pair but $500 is more likely. __________________ Thatch

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5th June 2002, 05:04 AM	#3
Aud_Mot diyAudio Member Join Date: Apr 2002 Location: California	PassFan, I assume you want to bridge 2 stereo a tube amps with output transformers. I have been told that differences from one transformer sample to the next can vary a great deal. One Xformer has a peak here, the other one has a valley there. This summing makes for a poor total. The older the transformer, the greater the tolerences between units. This is especially true with the Dynaco transformers Thatch_Ear mentions. If you have 2 identical stereo amps you wish to use, maybe a bi-amp situation could be of useful? Just a suggestion. Aud_Mot