The Amp Garage

Ok cool I will check with heat when I get home from work. Thanks. It’s interesting to me because I have always just purchased different types but have never dug deeper to see differences.

Just for comparison I had a carbon film nearby so I scraped the coating away. Unfortunately I don’t have a metal film handy.

Here is one with the coating scraped away.

Awesome. Thanks for the info! I cut one open to see. I had to whack it with a screwdriver and the other half went flying into the abyss. lol

Hey guys, would any of you that have been around a few blocks know what type of 1/2w 2% resistors these are? I can’t find any info on them or the RC crown logo. Do you know if they are metal or carbon film? I have a bag of them that came out of a beat up old tube organ someone had put out on the sid...

It does lack the rectifier tube and there's a master volym and a mid control in the tonestack. It has a generic Fender 40w output transformer. Pre phase inverter master and fixed presence. Individual bias controls for each power tube. I’m color blind so I don’t do well with identifying resistor val...

Looks to me like it’s based on a single channel of the 5f6a tweed bassman.

It's easy to know what you are thinking but twist it around when you write it out. OTOH, it's easy to know what you are thinking but twist it around when you are reading. I'm guilty of both! :mrgreen: I will say I’m envious of how you guys can communicate technical concepts so clearly and concisely...

Cdemike, Regarding the switched cathode caps I have done that on other stages with great results. I tried it once on an input stage of a silverface bassman and it hummed like crazy with no cap. I have read that it’s best practice to fully bypass an input stage for that reason but I also know that it...

Sluckey, I thought that is what I said in my original post. Maybe not. I find it difficult to get these things out of my brain and write them down so they make sense. lol

I appreciate your input.

Cdemike, the goal is high/low sensitivity inputs with lower noise on the high input and possibly a different flavor. And I was wondering if when running the low input through the single triode if that triode would be operating as if it had the 110k plate and 1.5k cathode or if it would still be like...

Thanks guys. Martin, will the output signal cancelation vary at different frequencies depending on the voltage fluctuation or will it just be lower output across all frequencies?

Do I have it backwards? Using 110k Rp and 1.5k Rk with parallel triodes is like using 220k Rp and 3k Rk on a single triode. This is correct, right?

Hey all, it’s been a minute since I’ve been building but have been diving back in recently. I have a question about parallel triodes specifically on the input stage… The scenario is running parallel plates and cathodes but using separate inputs so you can either run into one or both of the triodes s...

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