Is this describing a blown tube, or two blow tubes?

@tonydennison 

Before installing new power power the bias pot(s) should be turned back (turn the bias pot(s) counterclockwise), so as to not over bias the new tubes. Not doing so can damage perfectly good new tubes.

"Output tube bias should be set immediately when new tubes are put in; then again in 15 minutes;"

Did you do this before and after installing the new tubes?

You said you reinstalled the old tubes and the amp works fine. Just a guess the bias setting was still set for the old used tubes. Is that correct?

@jea48 

"

"Output tube bias should be set immediately when new tubes are put in; then again in 15 minutes; Did you do this before and after installing the new tubes?"

I did both of those things, yes, and Ive checked the old tubes' bias  I just put back  a few times and they have settled.

Thanks for pointing this out, just in case.

TD

Well, Tube depot offered a refund so the quad is heading back today.

I am going to order a quad of GL 77's, but I have to go on vacation which totally sucks when there's music to listen to :-). I will be bringing my portable DSD player, but...

For the moment I have the 88's back in :-(

Thanks for the help

TD

I didn’t look at the price of that accurate 151, that’s WAAAAYYYY to high.

This one’s good price

https://www.ebay.com/itm/404295487358?hash=item5e21e38f7e:g:O1YAAOSwWQtkZmoZ&amdata=enc%3AAQAIAAAAwC1YTf3n7cizsICFH96ltWjSy%2FjSjZHMVc6qVI%2BO004Vx4SJ4jcNPtaOWNwrv2N7DlnyQNMbNoFGqN7aNIZt3XWwdEaVyTF6pwFZdu9cCAiARexi7ble7oSBvrhjHvNAcCpRuTmJgTwCgBqChO%2FQrunhLTTjcGnuDrkBYulpQU3uBYO9RETs5wwCvFdVH8j%2FvhyDp6mw6T0rIr1KwjvK1pn2nrrVbpMkIAWmgQukX4dqT7dQLxhrmFiL2sy5r0l77w%3D%3D%7Ctkp%3ABk9SR6zA3seuYg

Nice working B&K, $295

https://www.vintageaudioexchange.com/product/bk-tube-tester-model-625

Precision, says works

https://www.ebay.com/itm/266329557361?hash=item3e027a8971&amdata=enc%3AAQAIAAAA4P9sRqls6flZN9gOpG4aK8VKRs99TgL5y1aeMCtXvu5O5yazAA7wxrLDEyC22MqnAkbFb%252Flx6FKjjH1uiBqC57J1POJ3BADBcixRATSBhyzNCe47K2wR56vHHR6ezAt%252FmWC6SeL0tkgCTBMRRastnq0LqZMGqDTdHyi%252BtjPzKQisRhTJvRQMFpUj1rMw4GiECt71Z7xMwm4%252F0qi4hYOSCyVqQFXHu76nj%252F4wjQPAHe6b1Dw7Cym%252FvUb4YmHY2HoRNH%252Bkewb4JR9fYXlQtnB7oasSv7eJLM8467UxTV2cmkoS%7Campid%3APL_CLK

B&K

https://www.ebay.com/itm/145184256106?hash=item21cda7f06a:g:lkQAAOSw5YVkhlvZ&amdata=enc%3AAQAIAAAA4DwkyFAzCFRGZwShAqTaokAzrtLTEfiXAUIPx1mBGe5eldbnilLzy%2BGIs0wWjqAbhKxtYU6QI4nxAfp6FvJgUonNpNCjUYEgTfE1%2FHUJL77l6Cc%2BZv4If9VvYa8tmCs%2BHd5gx7%2B5dy9JtS5d8xAMkmvEhGz%2FS2xgpHTLxF2Nw5bvmncs7aKtD7TJnH6W9smttXEczZ8MyK48lu4knrSrOTEvDYh4q29CqmLWoJnpzs4XzMqQMBd85q%2BOvbTX0Kv5d6jDm2LTTcpuzmvBs6JjQGnMeiJJx0kinC2oTNHb8SVE%7Ctkp%3ABk9SR8bNvsauYg

Sencore Mighty Mite, Calibrated (read description)

https://www.ebay.com/itm/166229429470?hash=item26b40bccde:g:pK8AAOSwWGZkg5V-&amdata=enc%3AAQAIAAAAwEYV0EYc%2BbwEn80v%2FWsQi2RuN8Q%2BTdC5rAp0Z3t9duUVn8f9FQ0Bvcoekj%2BJ6v5abIw5LRY1nj3jI9CF%2Beh3ENWhJjtGB9VceWcFKyGby6kzIW2Koi%2F36kaIHnbKOlTksg99mN8cqUsBGB%2F5bncO3Zy7w%2BbvYYtLxsj9Ji75%2F%2FDarmkjImCRWFjVvRSMuuMT5uAcXb%2Fdu0Jij3Y%2F9CnkdbQlffTn7pkSWXpBfRz2gu8a4vinueTjBddU3wC%2BEj6uOg%3D%3D%7Ctkp%3ABk9SR8bNvsauYg

Precision

https://www.ebay.com/itm/285384079762?hash=item4272377992:g:VPsAAOSwKKVks2lO&amdata=enc%3AAQAIAAAA4L%2BzNciGaH0MjHumCzeRg%2FpUEzwDB0%2FW6j7CM%2BeRBmmYKIBZDHrSEqOGjPOZWHwjaS1g%2BYehqMn3BAcxmIc9%2FOmVYcjpVCQ%2BQXlDvRMBsK92hMCYsVRgetA4JFUV97KlrkxondR4Wa2lKQ7VgNDBTHx09GADSUNGlQNm%2FrL2VL2IDSo3q5O0jlfFlqhCcLHopljnq3a%2F6j%2B%2B6czzzkRO9Kk8SxV2azF5bC4um4t9XfRNi1OhYgUlN04tXrP9wtL0g8%2BA%2BtnhcJMM2g0N2ihl8F6%2FZNbzmu4II84BIQMN4AUh%7Ctkp%3ABk9SR8zNvsauYg

ANKO, working

https://www.ebay.com/itm/364352890739?hash=item54d51fe773:g:5egAAOSwdkZkZaPR&amdata=enc%3AAQAIAAAA4LJwBBvxsVp%2FnIqZSamNcLBuGnrL6%2FvVzqKnwtqGz3S6DhEz4VFtGOvoe6A426c23OfJLG928jv44%2FgAnoKZ17T3YW6ODF7ZSN9dlc1gIckfskoTvZs6XWtZRnp03J%2Bj1BkEWJdBamI20BfT2uYMXQCIMA3xOIqjGs4WXBolYZfS%2FUWTbXE05DbzVXeR5X935TXMEjqnyLSTIcMDlXVXgaXCtciI4cQqANqLbYsjjoSoM1UekslnX3w1YsN0hR3YG8pzOCYc4HDvqKREDmpExmtEKDpugp2vLNio0g4eNQde%7Ctkp%3ABk9SR9iWmceuYg

EMC,

@elliottbnewcombjr 

Honestly i virtually always buy a set of tubes and then I dont think about them for many years. I just dont see myself buying a tester, but I do apprecite the time you took for me. Im sure it will help another reader that can findb use for it.

thanx

T