There has been some recent discussion here of octal preamp tubes. There are several boutique guitar amps using these tubes. The octal preamp tubes I am familar with were used in tweed Fenders and many other vintage tube amps. Can I solicit some opinions from anyone who has tried any octal preamp tubes?
The 6SJ7 is a pentode preamp tube that was used in the first Fender Champ. Many of these have a metal envelope, but glass bottle ones are available. Phil recently mentioned using one in a tube pedal. In the Angela Instruments online tube list, Steve compares the tone with the EF86. Sort of interesting and he has NOS 6SJ7's for $8. I wasn't able to find any new production for this tube. Has anyone out there tried this tube? Can you recommend a particular brand for tone or sturdiness?![Amp Amp](https://guitar-auctions.co.uk/wp-content/uploads/2015/11/lot0337.jpg)
The 6SL7 is a high Mu (amplification factor of 70) twin triode. It was used in the early Princton and Bassman. This would seem to be an excellent candidate considering it's gain but it has a reputation for being noisy. Can anyone confirm that? There seems to be only one modern version available.
The rest of the tweed Fenders used the 6SC7 twin triode(amplification factor 70). No modern versions are being made. Also has a reputation for being noisy. Anyone using these in a homebrew?
The 6SN7 twin triode(amplification factor 20) is the octal preamp tube most people seem to be using despite it's low gain. It is said to be quieter than the other octal twin triodes and is used in many tube hi-fi amps. There are several modern versions of this tube available also. Does anyone have an idea which are the quietest and how they sound?
I am also interested in trying the 7199 in a preamp. This is a 9 pin miniature tube not an octal, but it is interesting. It has a pentode and a triode in a single bottle like the ECL82 and ECL86. But the pentode section is not a power amp like those other tubes. It is a preamp pentode. So the pentode section could be used at the input and cascaded to the triode section either before, or after, the tone controls. Should have plenty of gain. Anyone tried this tube in a preamp?
markd
The 6SJ7 is a pentode preamp tube that was used in the first Fender Champ. Many of these have a metal envelope, but glass bottle ones are available. Phil recently mentioned using one in a tube pedal. In the Angela Instruments online tube list, Steve compares the tone with the EF86. Sort of interesting and he has NOS 6SJ7's for $8. I wasn't able to find any new production for this tube. Has anyone out there tried this tube? Can you recommend a particular brand for tone or sturdiness?
This is an excellent 'ALL TUBE' Guitar/Microphone 6SL7 or 6SN7 preamp! About 40 db gain with 6SL7 and 25-30 db with the 6SN7. These tubes have a super warm, clean and excellent tone.
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- Hoffman Amplifiers Tube Amp Forum, 6SJ7 vs 6SH7? You know Joe, I have heard all the things relating to the horror stories, but since I began this hobby with old radios, the old tubes along with using the chassis for filiment circuits seemed to work fine.
![Amp Amp](https://guitar-auctions.co.uk/wp-content/uploads/2015/11/lot0337.jpg)
The 6SL7 is a high Mu (amplification factor of 70) twin triode. It was used in the early Princton and Bassman. This would seem to be an excellent candidate considering it's gain but it has a reputation for being noisy. Can anyone confirm that? There seems to be only one modern version available.
The rest of the tweed Fenders used the 6SC7 twin triode(amplification factor 70). No modern versions are being made. Also has a reputation for being noisy. Anyone using these in a homebrew?
The 6SN7 twin triode(amplification factor 20) is the octal preamp tube most people seem to be using despite it's low gain. It is said to be quieter than the other octal twin triodes and is used in many tube hi-fi amps. There are several modern versions of this tube available also. Does anyone have an idea which are the quietest and how they sound?
Guitar Amp 6sn7 Sound Kit
I am also interested in trying the 7199 in a preamp. This is a 9 pin miniature tube not an octal, but it is interesting. It has a pentode and a triode in a single bottle like the ECL82 and ECL86. But the pentode section is not a power amp like those other tubes. It is a preamp pentode. So the pentode section could be used at the input and cascaded to the triode section either before, or after, the tone controls. Should have plenty of gain. Anyone tried this tube in a preamp?
markd
Jeremy Fix Single Ended 6SN7 Adblock chrome download mac installer.
Here we have an extremely unusual little single ended 6SN7 amplifier. This was designed and built by Jeremy Fix; a very talented scratch builder who sells his amps on eBay. His website can be found here.
Guitar Amp 6sn7 Sound Effects
I’ve never seen another amp that uses the 6SN7 as an output tube and it is really interesting to hear the differences in all of the brands and types. 6SN7 is certainly a rich tube type to pick through, and if you want to know just how a particular type of 6SN7 sounds, this is the amp for you. I’ve found my sweet spot for this one is a combination of Sylvania “bad boys” and RCA grey glass, but NOS Soviet 1578 porthole plate tubes were very good too.
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At around two watts, I’ve found it needs a bit of preamp gain to play really well on most speakers. That said, the sound here is exceptional. Female vocals in particular are really great with this amp; very much in the room and “live”. The soundstage is amazing too, and is easily one of the best I have heard. This diminutive little amp that has put several much higher priced pieces of equipment to shame.
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DHCP Snooping so dhcp-snooping support is added later. Yes, the text you quote describes the situation where yes the edge switch is routing and acting as ip-helper. But multiple ip-helpers are used in the path to reach the dhcpserver. The DHCP Snooping feature on ProCurve ProVision switches allows you to configure switches to accept DHCP responses only from authorized servers that are connected to trusted ports. You can build a custom issue and run the command 'show dhcp-snooping' then parse it and look for the correct data then generate an Issue in NetMRI If you post the output I can see if I have some time next week to help you in the write direction. I would like to know whether is DHCP Snooping feature unavailable in this switch model? I tried type in the command but it didnt recognize it. If this model didnt come with this feature, is there any way to prevent rogue dhcp server? This thread has been moved from Comware-Based to ProCurve / ProVision-Based.HP Forum Moderator. Hp switch dhcp snooping configuration. To enable DHCP snooping on a VLAN or range of VLANs enter this command: HP Switch (config)# dhcp-snooping vlan You can also use this command in the vlan context, in which case you cannot enter a range of VLANs for snooping. Below is an example of DHCP snooping enabled on VLAN 4.