Recent content by Salbreth1

I'v used this fan a few times. It drops right in, parameters similar, quiet and cheap. Just be sure to note the rotation. Sal https://www.digikey.com/product-detail/en/nmb-technologies-corporation/4715FS-12T-B50-D00/P12896-ND/740253

wow, that's pretty awesome. I'd grab some felt washers before you mount it, lol

Thanks! I’ve had a few more and here and did an A/B comparison with a 510mr I recently finished. The 500 takes the cake in my opinion. And yea, I ended up replacing the fans. The new ones are cheap and much quieter.

I had this happen on two 2500s. I just pressed it back in but one wriggled back out after taking a trip with it. Good idea to keep it in place.

hmm... James Martini. In the Maxell "blown away" picture featuring the L100s there is a martini glass also being blown away. Coincidence?

Merry Christmas everyone!

You can use your DMM to check it. You should have about a 1.2v voltage drop across it. It can be replaced with two 1n4148s connected in series, cathode to anode.

You can use 1n4737A, its 7.5v, 1w. Sal

I would replace the zeners while you have it apart. I use 30v with no issues. Might as well replace the 24v zeners on the power supplies, Q809. There is also a 7.1v on the relay board but I don't know how crazy you want to get. 24v, 1w...

No problem, and sure post a thread. This is a great amp that should be done right. I have built several of them and they never disappoint. Good Luck! Sal

Hi Terry, Here are the trimmers I used They are available at digikey.com. I used a multi-turn for the amps and single turns for the Relay board. Amplifiers: 2pc - https://www.digikey.com/product-detail/en/bourns-inc/3296W-1-223LF/3296W-1-223LF-ND/2535906 Relay board: 2pc -...

So today I did some tube matching to see what my 6CA7s were drawing. I used the Metheod in the link below which basically has you rotating tubes into a one chosen socket while leaving both tubes in the other channel and measuring the voltage on the plate resistor for each one. Looks like I have...

It's the access that I didn't plan for. I deleted all the wiring for the Pam. So to check the bias I have to flip it up on its side. PITA! I'll probably drill two small holes on the sides with contact points to insert dmm probes. I compared data sheets for different driver tubes I see people...